diff --git a/src/Calendar.js b/src/Calendar.js
index d32595b..6f3536a 100644
--- a/src/Calendar.js
+++ b/src/Calendar.js
@@ -22,8 +22,8 @@ function Calendar(element, options, eventSources) {
 	t.today = today;
 	t.gotoDate = gotoDate;
 	t.incrementDate = incrementDate;
-	t.formatDate = function(format, date) { return formatDate(format, date, options) };
-	t.formatDates = function(format, date1, date2) { return formatDates(format, date1, date2, options) };
+	t.formatDate = function(date, format) { return date.toString(format, options) };
+	t.formatDates = function(date1, date2, format) { return date1.toString(date2, format, options) };
 	t.getDate = getDate;
 	t.getView = getView;
 	t.option = option;
@@ -49,7 +49,7 @@ function Calendar(element, options, eventSources) {
 	var absoluteViewElement;
 	var resizeUID = 0;
 	var ignoreWindowResize = 0;
-	var date = new Date();
+	var date = new MightyDate();
 	var events = [];
 	var _dragElement;
 	
@@ -59,7 +59,13 @@ function Calendar(element, options, eventSources) {
 	-----------------------------------------------------------------------------*/
 	
 	
-	setYMD(date, options.year, options.month, options.date);
+	if (options.year) {
+		date = new MightyDate(
+			options.year,
+			options.month || 0,
+			options.date || 1
+		);
+	}
 	
 	
 	function render(inc) {
@@ -198,7 +204,9 @@ function Calendar(element, options, eventSources) {
 			}
 			
 			var forceEventRender = false;
-			if (!currentView.start || inc || date < currentView.start || date >= currentView.end) {
+			if (
+				!currentView.start || inc || date.before(currentView.start) || !date.before(currentView.end)
+			) {
 				// view must render an entire new date range (and refetch/render events)
 				currentView.render(date, inc || 0); // responsible for clearing events
 				setSize(true);
@@ -221,8 +229,8 @@ function Calendar(element, options, eventSources) {
 			elementOuterWidth = element.outerWidth();
 			
 			header.updateTitle(currentView.title);
-			var today = new Date();
-			if (today >= currentView.start && today < currentView.end) {
+			var today = new MightyDate();
+			if (!today.before(currentView.start) && today.before(currentView.end)) { // within range
 				header.disableButton('today');
 			}else{
 				header.enableButton('today');
@@ -391,28 +399,32 @@ function Calendar(element, options, eventSources) {
 	
 	
 	function prevYear() {
-		addYears(date, -1);
+		date.addYears(-1, true);
 		renderView();
 	}
 	
 	
 	function nextYear() {
-		addYears(date, 1);
+		date.addYears(1, true);
 		renderView();
 	}
 	
 	
 	function today() {
-		date = new Date();
+		date = new MightyDate();
 		renderView();
 	}
 	
 	
 	function gotoDate(year, month, dateOfMonth) {
-		if (year instanceof Date) {
-			date = cloneDate(year); // provided 1 argument, a Date
+		if (typeof year == 'object') {
+			date = new MightyDate(year); // provided 1 argument, a Date or MightyDate
 		}else{
-			setYMD(date, year, month, dateOfMonth);
+			date = new MightyDate(
+				year,
+				month || 0,
+				dateOfMonth || 1
+			);
 		}
 		renderView();
 	}
@@ -420,20 +432,20 @@ function Calendar(element, options, eventSources) {
 	
 	function incrementDate(years, months, days) {
 		if (years !== undefined) {
-			addYears(date, years);
+			date.addYears(years, true);
 		}
 		if (months !== undefined) {
-			addMonths(date, months);
+			date.addMonths(months, true);
 		}
 		if (days !== undefined) {
-			addDays(date, days);
+			date.addDays(days);
 		}
 		renderView();
 	}
 	
 	
 	function getDate() {
-		return cloneDate(date);
+		return date.clone();
 	}
 	
 	
diff --git a/src/EventManager.js b/src/EventManager.js
index 4d159ab..95bc43c 100644
--- a/src/EventManager.js
+++ b/src/EventManager.js
@@ -53,7 +53,7 @@ function EventManager(options, _sources) {
 	
 	
 	function isFetchNeeded(start, end) {
-		return !rangeStart || start < rangeStart || end > rangeEnd;
+		return !rangeStart || start.before(rangeStart) || end.after(rangeEnd);
 	}
 	
 	
@@ -94,7 +94,7 @@ function EventManager(options, _sources) {
 		var fetchers = fc.sourceFetchers;
 		var res;
 		for (i=0; i<fetchers.length; i++) {
-			res = fetchers[i](source, rangeStart, rangeEnd, callback);
+			res = fetchers[i](source, rangeStart.clone(), rangeEnd.clone(), callback);
 			if (res === true) {
 				// the fetcher is in charge. made its own async request
 				return;
@@ -109,7 +109,7 @@ function EventManager(options, _sources) {
 		if (events) {
 			if ($.isFunction(events)) {
 				pushLoading();
-				events(cloneDate(rangeStart), cloneDate(rangeEnd), function(events) {
+				events(rangeStart.clone(), rangeEnd.clone(), function(events) {
 					callback(events);
 					popLoading();
 				});
@@ -208,22 +208,23 @@ function EventManager(options, _sources) {
 	-----------------------------------------------------------------------------*/
 	
 	
-	function updateEvent(event) { // update an existing event
+	function updateEvent(event) { // update an existing event // TODO: test thoroughly
 		var i, len = cache.length, e,
 			defaultEventEnd = getView().defaultEventEnd, // getView???
-			startDelta = event.start - event._start,
-			endDelta = event.end ?
-				(event.end - (event._end || defaultEventEnd(event))) // event._end would be null if event.end
-				: 0;                                                      // was null and event was just resized
+			startDelta = event._start.diffMilliseconds(event.start),
+			endDelta =
+				event.end ?
+				(event._end || defaultEventEnd(event)).diffMilliseconds(event.end) : // event._end would be null if event.end
+				0;                                                                   // was null and event was just resized
 		for (i=0; i<len; i++) {
 			e = cache[i];
 			if (e._id == event._id && e != event) {
-				e.start = new Date(+e.start + startDelta);
+				e.start.addMilliseconds(startDelta);
 				if (event.end) {
 					if (e.end) {
-						e.end = new Date(+e.end + endDelta);
+						e.end.addMilliseconds(endDelta);
 					}else{
-						e.end = new Date(+defaultEventEnd(e) + endDelta);
+						e.end = defaultEventEnd(e).addMilliseconds(endDelta);
 					}
 				}else{
 					e.end = null;
@@ -334,12 +335,12 @@ function EventManager(options, _sources) {
 			}
 			delete event.date;
 		}
-		event._start = cloneDate(event.start = parseDate(event.start, ignoreTimezone));
+		event._start = (event.start = parseDate(event.start, ignoreTimezone)).clone();
 		event.end = parseDate(event.end, ignoreTimezone);
-		if (event.end && event.end <= event.start) {
+		if (event.end && !event.end.after(event.start)) {
 			event.end = null;
 		}
-		event._end = event.end ? cloneDate(event.end) : null;
+		event._end = event.end ? event.end.clone() : null;
 		if (event.allDay === undefined) {
 			event.allDay = firstDefined(source.allDayDefault, options.allDayDefault);
 		}
diff --git a/src/_loader.js b/src/_loader.js
index 449160f..03d2b8b 100644
--- a/src/_loader.js
+++ b/src/_loader.js
@@ -42,7 +42,7 @@ js('main.js');
 js('Calendar.js');
 js('Header.js');
 js('EventManager.js');
-js('date_util.js');
+js('mightydate.js');
 js('util.js');
 
 js('basic/MonthView.js');
diff --git a/src/agenda/AgendaDayView.js b/src/agenda/AgendaDayView.js
index 12b6b56..fed718b 100644
--- a/src/agenda/AgendaDayView.js
+++ b/src/agenda/AgendaDayView.js
@@ -19,13 +19,13 @@ function AgendaDayView(element, calendar) {
 	
 	function render(date, delta) {
 		if (delta) {
-			addDays(date, delta);
+			date.addDays(delta);
 			if (!opt('weekends')) {
 				skipWeekend(date, delta < 0 ? -1 : 1);
 			}
 		}
-		var start = cloneDate(date, true);
-		var end = addDays(cloneDate(start), 1);
+		var start = date.clone().clearTime();
+		var end = start.clone().addDays(1);
 		t.title = formatDate(date, opt('titleFormat'));
 		t.start = t.visStart = start;
 		t.end = t.visEnd = end;
diff --git a/src/agenda/AgendaEventRenderer.js b/src/agenda/AgendaEventRenderer.js
index 9e7243b..efb8bb2 100644
--- a/src/agenda/AgendaEventRenderer.js
+++ b/src/agenda/AgendaEventRenderer.js
@@ -103,14 +103,14 @@ function AgendaEventRenderer() {
 		var colCnt = getColCnt(),
 			minMinute = getMinMinute(),
 			maxMinute = getMaxMinute(),
-			d = addMinutes(cloneDate(t.visStart), minMinute),
+			d = t.visStart.clone().addMinutes(minMinute),
 			visEventEnds = $.map(events, slotEventEnd),
 			i, col,
 			j, level,
 			k, seg,
 			segs=[];
 		for (i=0; i<colCnt; i++) {
-			col = stackSegs(sliceSegs(events, visEventEnds, d, addMinutes(cloneDate(d), maxMinute-minMinute)));
+			col = stackSegs(sliceSegs(events, visEventEnds, d, d.clone().addMinutes(maxMinute-minMinute)));
 			countForwardSegs(col);
 			for (j=0; j<col.length; j++) {
 				level = col[j];
@@ -121,7 +121,7 @@ function AgendaEventRenderer() {
 					segs.push(seg);
 				}
 			}
-			addDays(d, 1, true);
+			d.addDays(1);
 		}
 		return segs;
 	}
@@ -129,9 +129,9 @@ function AgendaEventRenderer() {
 	
 	function slotEventEnd(event) {
 		if (event.end) {
-			return cloneDate(event.end);
+			return event.end.clone();
 		}else{
-			return addMinutes(cloneDate(event.start), opt('defaultEventMinutes'));
+			return event.start.clone().addMinutes(opt('defaultEventMinutes'));
 		}
 	}
 	
@@ -383,8 +383,8 @@ function AgendaEventRenderer() {
 						if (!cell.row) {
 							// on full-days
 							renderDayOverlay(
-								addDays(cloneDate(event.start), dayDelta),
-								addDays(exclEndDay(event), dayDelta)
+								event.start.clone().addDays(dayDelta).clearTime(),
+								exclEndDay(event).addDays(dayDelta).clearTime()
 							);
 							resetElement();
 						}else{
@@ -396,8 +396,7 @@ function AgendaEventRenderer() {
 									setOuterHeight(
 										eventElement,
 										slotHeight * Math.round(
-											(event.end ? ((event.end - event.start) / MINUTE_MS) : opt('defaultEventMinutes'))
-											/ opt('slotMinutes')
+											(event.end ? event.start.diffMinutes(event.end) : opt('defaultEventMinutes')) / opt('slotMinutes')
 										)
 									);
 									eventElement.draggable('option', 'grid', [colWidth, 1]);
@@ -490,8 +489,8 @@ function AgendaEventRenderer() {
 								eventElement.draggable('option', 'grid', null);
 							}
 							renderDayOverlay(
-								addDays(cloneDate(event.start), dayDelta),
-								addDays(exclEndDay(event), dayDelta)
+								event.start.clone().addDays(dayDelta).clearTime(),
+								exclEndDay(event).addDays(dayDelta).clearTime()
 							);
 						}else{
 							// on slots
@@ -527,10 +526,10 @@ function AgendaEventRenderer() {
 			}
 		});
 		function updateTimeText(minuteDelta) {
-			var newStart = addMinutes(cloneDate(event.start), minuteDelta);
+			var newStart = event.start.clone().addMinutes(minuteDelta);
 			var newEnd;
 			if (event.end) {
-				newEnd = addMinutes(cloneDate(event.end), minuteDelta);
+				newEnd = event.end.clone().addMinutes(minuteDelta);
 			}
 			timeElement.text(formatDates(newStart, newEnd, opt('timeFormat')));
 		}
@@ -572,7 +571,7 @@ function AgendaEventRenderer() {
 						formatDates(
 							event.start,
 							(!slotDelta && !event.end) ? null : // no change, so don't display time range
-								addMinutes(eventEnd(event), opt('slotMinutes')*slotDelta),
+								eventEnd(event).addMinutes(opt('slotMinutes')*slotDelta),
 							opt('timeFormat')
 						)
 					);
diff --git a/src/agenda/AgendaView.js b/src/agenda/AgendaView.js
index 2a4373c..e22d318 100644
--- a/src/agenda/AgendaView.js
+++ b/src/agenda/AgendaView.js
@@ -273,11 +273,11 @@ function AgendaView(element, calendar, viewName) {
 		s =
 			"<table class='fc-agenda-slots' style='width:100%' cellspacing='0'>" +
 			"<tbody>";
-		d = zeroDate();
-		maxd = addMinutes(cloneDate(d), maxMinute);
-		addMinutes(d, minMinute);
+		d = t.visStart.clone();
+		maxd = d.clone().addMinutes(maxMinute);
+		d.addMinutes(minMinute);
 		slotCnt = 0;
-		for (i=0; d < maxd; i++) {
+		for (i=0; d.before(maxd); i++) {
 			minutes = d.getMinutes();
 			s +=
 				"<tr class='fc-slot" + i + ' ' + (!minutes ? '' : 'fc-minor') + "'>" +
@@ -288,7 +288,7 @@ function AgendaView(element, calendar, viewName) {
 				"<div style='position:relative'>&nbsp;</div>" +
 				"</td>" +
 				"</tr>";
-			addMinutes(d, opt('slotMinutes'));
+			d.addMinutes(opt('slotMinutes'));
 			slotCnt++;
 		}
 		s +=
@@ -309,13 +309,13 @@ function AgendaView(element, calendar, viewName) {
 		var headCell;
 		var bodyCell;
 		var date;
-		var today = clearTime(new Date());
+		var today = new MightyDate().clearTime();
 		for (i=0; i<colCnt; i++) {
 			date = colDate(i);
 			headCell = dayHeadCells.eq(i);
 			headCell.html(formatDate(date, colFormat));
 			bodyCell = dayBodyCells.eq(i);
-			if (+date == +today) {
+			if (date.equals(today)) {
 				bodyCell.addClass(tm + '-state-highlight fc-today');
 			}else{
 				bodyCell.removeClass(tm + '-state-highlight fc-today');
@@ -394,8 +394,8 @@ function AgendaView(element, calendar, viewName) {
 
 
 	function resetScroll() {
-		var d0 = zeroDate();
-		var scrollDate = cloneDate(d0);
+		var d0 = t.visStart.clone();
+		var scrollDate = d0.clone();
 		scrollDate.setHours(opt('firstHour'));
 		var top = timePosition(d0, scrollDate) + 1; // +1 for the border
 		function scroll() {
@@ -457,17 +457,18 @@ function AgendaView(element, calendar, viewName) {
 	
 
 	function renderDayOverlay(startDate, endDate, refreshCoordinateGrid) { // endDate is exclusive
+		// TODO: get straight whether caller needs to do clearTime or not
 		if (refreshCoordinateGrid) {
 			coordinateGrid.build();
 		}
-		var visStart = cloneDate(t.visStart);
+		var visStart = t.visStart;
 		var startCol, endCol;
 		if (rtl) {
-			startCol = dayDiff(endDate, visStart)*dis+dit+1;
-			endCol = dayDiff(startDate, visStart)*dis+dit+1;
+			startCol = visStart.diffDays(endDate)*dis+dit+1;
+			endCol = visStart.diffDays(startDate)*dis+dit+1;
 		}else{
-			startCol = dayDiff(startDate, visStart);
-			endCol = dayDiff(endDate, visStart);
+			startCol = visStart.diffDays(startDate);
+			endCol = visStart.diffDays(endDate);
 		}
 		startCol = Math.max(0, startCol);
 		endCol = Math.min(colCnt, endCol);
@@ -486,12 +487,12 @@ function AgendaView(element, calendar, viewName) {
 	
 
 	function renderSlotOverlay(overlayStart, overlayEnd) {
-		var dayStart = cloneDate(t.visStart);
-		var dayEnd = addDays(cloneDate(dayStart), 1);
+		var dayStart = t.visStart.clone();
+		var dayEnd = dayStart.clone().addDays(1);
 		for (var i=0; i<colCnt; i++) {
-			var stretchStart = new Date(Math.max(dayStart, overlayStart));
-			var stretchEnd = new Date(Math.min(dayEnd, overlayEnd));
-			if (stretchStart < stretchEnd) {
+			var stretchStart = overlayStart.before(dayStart) ? dayStart : overlayStart;
+			var stretchEnd = overlayEnd.after(dayEnd) ? dayEnd : overlayEnd;
+			if (stretchStart.before(stretchEnd)) {
 				var col = i*dis+dit;
 				var rect = coordinateGrid.rect(0, col, 0, col, slotContent); // only use it for horizontal coords
 				var top = timePosition(dayStart, stretchStart);
@@ -502,8 +503,8 @@ function AgendaView(element, calendar, viewName) {
 					renderOverlay(rect, slotContent)
 				);
 			}
-			addDays(dayStart, 1);
-			addDays(dayEnd, 1);
+			dayStart.addDays(1);
+			dayEnd.addDays(1);
 		}
 	}
 	
@@ -567,7 +568,7 @@ function AgendaView(element, calendar, viewName) {
 	
 	function dateCell(date) { // "cell" terminology is now confusing
 		return {
-			row: Math.floor(dayDiff(date, t.visStart) / 7),
+			row: t.visStart.diffWeeks(date),
 			col: dayOfWeekCol(date.getDay())
 		};
 	}
@@ -580,14 +581,14 @@ function AgendaView(element, calendar, viewName) {
 			slotIndex--;
 		}
 		if (slotIndex >= 0) {
-			addMinutes(d, minMinute + slotIndex * opt('slotMinutes'));
+			d.addMinutes(minMinute + slotIndex * opt('slotMinutes'));
 		}
 		return d;
 	}
 	
 	
 	function colDate(col) { // returns dates with 00:00:00
-		return addDays(cloneDate(t.visStart), col*dis+dit);
+		return t.visStart.clone().addDays(col*dis+dit);
 	}
 	
 	
@@ -605,11 +606,11 @@ function AgendaView(element, calendar, viewName) {
 	
 	// get the Y coordinate of the given time on the given day (both Date objects)
 	function timePosition(day, time) { // both date objects. day holds 00:00 of current day
-		day = cloneDate(day, true);
-		if (time < addMinutes(cloneDate(day), minMinute)) {
+		day = day.clone().clearTime();
+		if (time.before(day.clone().addMinutes(minMinute))) {
 			return 0;
 		}
-		if (time >= addMinutes(cloneDate(day), maxMinute)) {
+		if (!time.before(day.clone().addMinutes(maxMinute))) {
 			return slotTable.height();
 		}
 		var slotMinutes = opt('slotMinutes'),
@@ -639,11 +640,11 @@ function AgendaView(element, calendar, viewName) {
 	
 	
 	function defaultEventEnd(event) {
-		var start = cloneDate(event.start);
+		var start = event.start.clone();
 		if (event.allDay) {
 			return start;
 		}
-		return addMinutes(start, opt('defaultEventMinutes'));
+		return start.addMinutes(opt('defaultEventMinutes'));
 	}
 	
 	
@@ -654,16 +655,20 @@ function AgendaView(element, calendar, viewName) {
 	
 	function defaultSelectionEnd(startDate, allDay) {
 		if (allDay) {
-			return cloneDate(startDate);
+			return startDate.clone();
 		}
-		return addMinutes(cloneDate(startDate), opt('slotMinutes'));
+		return startDate.clone().addMinutes(opt('slotMinutes'));
 	}
 	
 	
 	function renderSelection(startDate, endDate, allDay) { // only for all-day
 		if (allDay) {
 			if (opt('allDaySlot')) {
-				renderDayOverlay(startDate, addDays(cloneDate(endDate), 1), true);
+				renderDayOverlay(
+					startDate.clone().clearTime(),
+					endDate.clone().addDays(1).clearTime(), // TODO: use util
+					true
+				);
 			}
 		}else{
 			renderSlotSelection(startDate, endDate);
@@ -675,7 +680,7 @@ function AgendaView(element, calendar, viewName) {
 		var helperOption = opt('selectHelper');
 		coordinateGrid.build();
 		if (helperOption) {
-			var col = dayDiff(startDate, t.visStart) * dis + dit;
+			var col = t.visStart.diffDays(startDate) * dis + dit;
 			if (col >= 0 && col < colCnt) { // only works when times are on same day
 				var rect = coordinateGrid.rect(0, col, 0, col, slotContent); // only for horizontal coords
 				var top = timePosition(startDate, startDate);
@@ -743,9 +748,9 @@ function AgendaView(element, calendar, viewName) {
 					var d2 = cellDate(cell);
 					dates = [
 						d1,
-						addMinutes(cloneDate(d1), opt('slotMinutes')),
+						d1.clone().addMinutes(opt('slotMinutes')),
 						d2,
-						addMinutes(cloneDate(d2), opt('slotMinutes'))
+						d2.clone().addMinutes(opt('slotMinutes'))
 					].sort(cmp);
 					renderSlotSelection(dates[0], dates[3]);
 				}else{
@@ -755,7 +760,7 @@ function AgendaView(element, calendar, viewName) {
 			$(document).one('mouseup', function(ev) {
 				hoverListener.stop();
 				if (dates) {
-					if (+dates[0] == +dates[1]) {
+					if (dates[0].equals(dates[1])) {
 						reportDayClick(dates[0], false, ev);
 					}
 					reportSelection(dates[0], dates[3], false, ev);
@@ -766,7 +771,7 @@ function AgendaView(element, calendar, viewName) {
 	
 	
 	function reportDayClick(date, allDay, ev) {
-		trigger('dayClick', dayBodyCells[dayOfWeekCol(date.getDay())], date, allDay, ev);
+		trigger('dayClick', dayBodyCells[dayOfWeekCol(date.getDay())], date.clone(), allDay, ev);
 	}
 	
 	
@@ -783,7 +788,7 @@ function AgendaView(element, calendar, viewName) {
 					renderCellOverlay(cell.row, cell.col, cell.row, cell.col);
 				}else{
 					var d1 = cellDate(cell);
-					var d2 = addMinutes(cloneDate(d1), opt('defaultEventMinutes'));
+					var d2 = d1.clone().addMinutes(opt('defaultEventMinutes'));
 					renderSlotOverlay(d1, d2);
 				}
 			}
diff --git a/src/agenda/AgendaWeekView.js b/src/agenda/AgendaWeekView.js
index 03d0f7e..fba01b6 100644
--- a/src/agenda/AgendaWeekView.js
+++ b/src/agenda/AgendaWeekView.js
@@ -19,12 +19,12 @@ function AgendaWeekView(element, calendar) {
 	
 	function render(date, delta) {
 		if (delta) {
-			addDays(date, delta * 7);
+			date.addWeeks(delta);
 		}
-		var start = addDays(cloneDate(date), -((date.getDay() - opt('firstDay') + 7) % 7));
-		var end = addDays(cloneDate(start), 7);
-		var visStart = cloneDate(start);
-		var visEnd = cloneDate(end);
+		var start = date.clone().clearTime().addDays(-((date.getDay() - opt('firstDay') + 7) % 7));
+		var end = start.clone().addWeeks(1);
+		var visStart = start.clone();
+		var visEnd = end.clone();
 		var weekends = opt('weekends');
 		if (!weekends) {
 			skipWeekend(visStart);
@@ -32,7 +32,7 @@ function AgendaWeekView(element, calendar) {
 		}
 		t.title = formatDates(
 			visStart,
-			addDays(cloneDate(visEnd), -1),
+			visEnd.clone().addDays(-1),
 			opt('titleFormat')
 		);
 		t.start = start;
diff --git a/src/basic/BasicDayView.js b/src/basic/BasicDayView.js
index ac9ffca..c9261f6 100644
--- a/src/basic/BasicDayView.js
+++ b/src/basic/BasicDayView.js
@@ -22,14 +22,14 @@ function BasicDayView(element, calendar) {
 	
 	function render(date, delta) {
 		if (delta) {
-			addDays(date, delta);
+			date.addDays(delta);
 			if (!opt('weekends')) {
 				skipWeekend(date, delta < 0 ? -1 : 1);
 			}
 		}
 		t.title = formatDate(date, opt('titleFormat'));
-		t.start = t.visStart = cloneDate(date, true);
-		t.end = t.visEnd = addDays(cloneDate(t.start), 1);
+		t.start = t.visStart = date.clone().clearTime();
+		t.end = t.visEnd = t.start.clone().addDays(1);
 		renderBasic(1, 1, 1, false);
 	}
 	
diff --git a/src/basic/BasicEventRenderer.js b/src/basic/BasicEventRenderer.js
index 3c1acc6..d59f604 100644
--- a/src/basic/BasicEventRenderer.js
+++ b/src/basic/BasicEventRenderer.js
@@ -53,8 +53,8 @@ function BasicEventRenderer() {
 	function compileSegs(events) {
 		var rowCnt = getRowCnt(),
 			colCnt = getColCnt(),
-			d1 = cloneDate(t.visStart),
-			d2 = addDays(cloneDate(d1), colCnt),
+			d1 = t.visStart.clone(),
+			d2 = d1.clone().addDays(colCnt),
 			visEventsEnds = $.map(events, exclEndDay),
 			i, row,
 			j, level,
@@ -71,8 +71,8 @@ function BasicEventRenderer() {
 					segs.push(seg);
 				}
 			}
-			addDays(d1, 7);
-			addDays(d2, 7);
+			d1.addWeeks(1);
+			d2.addWeeks(1);
 		}
 		return segs;
 	}
@@ -113,8 +113,8 @@ function BasicEventRenderer() {
 						//setOverflowHidden(true);
 						dayDelta = rowDelta*7 + colDelta * (opt('isRTL') ? -1 : 1);
 						renderDayOverlay(
-							addDays(cloneDate(event.start), dayDelta),
-							addDays(exclEndDay(event), dayDelta)
+							event.start.clone().addDays(dayDelta).clearTime(),
+							exclEndDay(event).addDays(dayDelta).clearTime()
 						);
 					}else{
 						//setOverflowHidden(false);
diff --git a/src/basic/BasicView.js b/src/basic/BasicView.js
index 9e08f6d..de12078 100644
--- a/src/basic/BasicView.js
+++ b/src/basic/BasicView.js
@@ -184,7 +184,7 @@ function BasicView(element, calendar, viewName) {
 	function updateCells(firstTime) {
 		var dowDirty = firstTime || rowCnt == 1; // could the cells' day-of-weeks need updating?
 		var month = t.start.getMonth();
-		var today = clearTime(new Date());
+		var today = new MightyDate().clearTime();
 		var cell;
 		var date;
 		var row;
@@ -206,7 +206,7 @@ function BasicView(element, calendar, viewName) {
 			}else{
 				cell.addClass('fc-other-month');
 			}
-			if (+date == +today) {
+			if (date.equals(today)) {
 				cell.addClass(tm + '-state-highlight fc-today');
 			}else{
 				cell.removeClass(tm + '-state-highlight fc-today');
@@ -296,29 +296,30 @@ function BasicView(element, calendar, viewName) {
 	
 	
 	function renderDayOverlay(overlayStart, overlayEnd, refreshCoordinateGrid) { // overlayEnd is exclusive
+		// TODO: get straight whether caller needs to do clearTime or not
 		if (refreshCoordinateGrid) {
 			coordinateGrid.build();
 		}
-		var rowStart = cloneDate(t.visStart);
-		var rowEnd = addDays(cloneDate(rowStart), colCnt);
+		var rowStart = t.visStart.clone();
+		var rowEnd = rowStart.clone().addDays(colCnt);
 		for (var i=0; i<rowCnt; i++) {
-			var stretchStart = new Date(Math.max(rowStart, overlayStart));
-			var stretchEnd = new Date(Math.min(rowEnd, overlayEnd));
-			if (stretchStart < stretchEnd) {
+			var stretchStart = overlayStart.before(rowStart) ? rowStart : overlayStart;
+			var stretchEnd = overlayEnd.after(rowEnd) ? rowEnd : overlayEnd;
+			if (stretchStart.before(stretchEnd)) {
 				var colStart, colEnd;
 				if (rtl) {
-					colStart = dayDiff(stretchEnd, rowStart)*dis+dit+1;
-					colEnd = dayDiff(stretchStart, rowStart)*dis+dit+1;
+					colStart = rowStart.diffDays(stretchEnd)*dis+dit+1;
+					colEnd = rowStart.diffDays(stretchStart)*dis+dit+1;
 				}else{
-					colStart = dayDiff(stretchStart, rowStart);
-					colEnd = dayDiff(stretchEnd, rowStart);
+					colStart = rowStart.diffDays(stretchStart);
+					colEnd = rowStart.diffDays(stretchEnd);
 				}
 				dayBind(
 					renderCellOverlay(i, colStart, i, colEnd-1)
 				);
 			}
-			addDays(rowStart, 7);
-			addDays(rowEnd, 7);
+			rowStart.addWeeks(1);
+			rowEnd.addWeeks(1);
 		}
 	}
 	
@@ -335,12 +336,16 @@ function BasicView(element, calendar, viewName) {
 	
 	
 	function defaultSelectionEnd(startDate, allDay) {
-		return cloneDate(startDate);
+		return startDate.clone();
 	}
 	
 	
 	function renderSelection(startDate, endDate, allDay) {
-		renderDayOverlay(startDate, addDays(cloneDate(endDate), 1), true); // rebuild every time???
+		renderDayOverlay(
+			startDate.clone().clearTime(),
+			endDate.clone().addDays(1).clearTime(), // TODO: use util
+			true // rebuild every time???
+		);
 	}
 	
 	
@@ -352,7 +357,7 @@ function BasicView(element, calendar, viewName) {
 	function reportDayClick(date, allDay, ev) {
 		var cell = dateCell(date);
 		var _element = bodyCells[cell.row*colCnt + cell.col];
-		trigger('dayClick', _element, date, allDay, ev);
+		trigger('dayClick', _element, date.clone(), allDay, ev);
 	}
 	
 	
@@ -387,7 +392,7 @@ function BasicView(element, calendar, viewName) {
 	
 	
 	function defaultEventEnd(event) {
-		return cloneDate(event.start);
+		return event.start.clone();
 	}
 	
 	
@@ -440,7 +445,7 @@ function BasicView(element, calendar, viewName) {
 	
 	function dateCell(date) {
 		return {
-			row: Math.floor(dayDiff(date, t.visStart) / 7),
+			row: t.visStart.diffWeeks(date),
 			col: dayOfWeekCol(date.getDay())
 		};
 	}
@@ -452,7 +457,7 @@ function BasicView(element, calendar, viewName) {
 	
 	
 	function _cellDate(row, col) {
-		return addDays(cloneDate(t.visStart), row*7 + col*dis+dit);
+		return t.visStart.clone().addDays(row*7 + col*dis+dit);
 		// what about weekends in middle of week?
 	}
 	
diff --git a/src/basic/BasicWeekView.js b/src/basic/BasicWeekView.js
index 34c0e48..05febaa 100644
--- a/src/basic/BasicWeekView.js
+++ b/src/basic/BasicWeekView.js
@@ -19,12 +19,12 @@ function BasicWeekView(element, calendar) {
 	
 	function render(date, delta) {
 		if (delta) {
-			addDays(date, delta * 7);
+			date.addWeeks(delta);
 		}
-		var start = addDays(cloneDate(date), -((date.getDay() - opt('firstDay') + 7) % 7));
-		var end = addDays(cloneDate(start), 7);
-		var visStart = cloneDate(start);
-		var visEnd = cloneDate(end);
+		var start = date.clone().clearTime().addDays(-((date.getDay() - opt('firstDay') + 7) % 7));
+		var end = start.clone().addWeeks(1);
+		var visStart = start.clone();
+		var visEnd = end.clone();
 		var weekends = opt('weekends');
 		if (!weekends) {
 			skipWeekend(visStart);
@@ -32,7 +32,7 @@ function BasicWeekView(element, calendar) {
 		}
 		t.title = formatDates(
 			visStart,
-			addDays(cloneDate(visEnd), -1),
+			visEnd.clone().addDays(-1),
 			opt('titleFormat')
 		);
 		t.start = start;
diff --git a/src/basic/MonthView.js b/src/basic/MonthView.js
index dabbceb..926c972 100644
--- a/src/basic/MonthView.js
+++ b/src/basic/MonthView.js
@@ -19,25 +19,23 @@ function MonthView(element, calendar) {
 	
 	function render(date, delta) {
 		if (delta) {
-			addMonths(date, delta);
-			date.setDate(1);
+			date.setDate(1).addMonths(delta);
 		}
-		var start = cloneDate(date, true);
-		start.setDate(1);
-		var end = addMonths(cloneDate(start), 1);
-		var visStart = cloneDate(start);
-		var visEnd = cloneDate(end);
+		var start = date.clone().setDate(1).clearTime();
+		var end = start.clone().addMonths(1);
+		var visStart = start.clone();
+		var visEnd = end.clone();
 		var firstDay = opt('firstDay');
 		var nwe = opt('weekends') ? 0 : 1;
 		if (nwe) {
 			skipWeekend(visStart);
 			skipWeekend(visEnd, -1, true);
 		}
-		addDays(visStart, -((visStart.getDay() - Math.max(firstDay, nwe) + 7) % 7));
-		addDays(visEnd, (7 - visEnd.getDay() + Math.max(firstDay, nwe)) % 7);
-		var rowCnt = Math.round((visEnd - visStart) / (DAY_MS * 7));
+		visStart.addDays(-((visStart.getDay() - Math.max(firstDay, nwe) + 7) % 7));
+		visEnd.addDays((7 - visEnd.getDay() + Math.max(firstDay, nwe)) % 7);
+		var rowCnt = visStart.diffWeeks(visEnd);
 		if (opt('weekMode') == 'fixed') {
-			addDays(visEnd, (6 - rowCnt) * 7);
+			visEnd.addWeeks(6 - rowCnt);
 			rowCnt = 6;
 		}
 		t.title = formatDate(start, opt('titleFormat'));
diff --git a/src/common/DayEventRenderer.js b/src/common/DayEventRenderer.js
index 1575a4e..934bd7a 100644
--- a/src/common/DayEventRenderer.js
+++ b/src/common/DayEventRenderer.js
@@ -438,7 +438,7 @@ function DayEventRenderer() {
 						}
 					}
 					dayDelta = (r*7 + c*dis+dit) - (origCell.row*7 + origCell.col*dis+dit);
-					var newEnd = addDays(eventEnd(event), dayDelta, true);
+					var newEnd = eventEnd(event).addDays(dayDelta);
 					if (dayDelta) {
 						eventCopy.end = newEnd;
 						var oldHelpers = helpers;
@@ -456,7 +456,11 @@ function DayEventRenderer() {
 						}
 					}
 					clearOverlays();
-					renderDayOverlay(event.start, addDays(cloneDate(newEnd), 1)); // coordinate grid already rebuild at hoverListener.start
+					renderDayOverlay(
+						event.start.clone().clearTime(),
+						newEnd.clone().addDays(1).clearTime() // TODO: use util
+					);
+					// coordinate grid already rebuild at hoverListener.start
 				}
 			}, ev);
 			
diff --git a/src/common/SelectionManager.js b/src/common/SelectionManager.js
index 9231805..4a64a29 100644
--- a/src/common/SelectionManager.js
+++ b/src/common/SelectionManager.js
@@ -60,7 +60,7 @@ function SelectionManager() {
 	
 	function reportSelection(startDate, endDate, allDay, ev) {
 		selected = true;
-		trigger('select', null, startDate, endDate, allDay, ev);
+		trigger('select', null, startDate.clone(), endDate.clone(), allDay, ev);
 	}
 	
 	
@@ -85,7 +85,7 @@ function SelectionManager() {
 			$(document).one('mouseup', function(ev) {
 				hoverListener.stop();
 				if (dates) {
-					if (+dates[0] == +dates[1]) {
+					if (dates[0].equals(dates[1])) {
 						reportDayClick(dates[0], true, ev);
 					}
 					reportSelection(dates[0], dates[1], true, ev);
diff --git a/src/common/View.js b/src/common/View.js
index e245acf..e6646c3 100644
--- a/src/common/View.js
+++ b/src/common/View.js
@@ -102,7 +102,7 @@ function View(element, calendar, viewName) {
 	
 	// returns a Date object for an event's end
 	function eventEnd(event) {
-		return event.end ? cloneDate(event.end) : defaultEventEnd(event);
+		return event.end ? event.end.clone() : defaultEventEnd(event);
 	}
 	
 	
@@ -232,9 +232,9 @@ function View(element, calendar, viewName) {
 			if (allDay !== undefined) {
 				e.allDay = allDay;
 			}
-			addMinutes(addDays(e.start, dayDelta, true), minuteDelta);
+			e.start.addDays(dayDelta).addMinutes(minuteDelta);
 			if (e.end) {
-				e.end = addMinutes(addDays(e.end, dayDelta, true), minuteDelta);
+				e.end.addDays(dayDelta).addMinutes(minuteDelta);
 			}
 			normalizeEvent(e, options);
 		}
@@ -245,7 +245,7 @@ function View(element, calendar, viewName) {
 		minuteDelta = minuteDelta || 0;
 		for (var e, len=events.length, i=0; i<len; i++) {
 			e = events[i];
-			e.end = addMinutes(addDays(eventEnd(e), dayDelta, true), minuteDelta);
+			e.end = eventEnd(e).addDays(dayDelta).addMinutes(minuteDelta);
 			normalizeEvent(e, options);
 		}
 	}
diff --git a/src/date_util.js b/src/date_util.js
deleted file mode 100644
index 9e2037a..0000000
--- a/src/date_util.js
+++ /dev/null
@@ -1,357 +0,0 @@
-
-
-fc.addDays = addDays;
-fc.cloneDate = cloneDate;
-fc.parseDate = parseDate;
-fc.parseISO8601 = parseISO8601;
-fc.parseTime = parseTime;
-fc.formatDate = formatDate;
-fc.formatDates = formatDates;
-
-
-
-/* Date Math
------------------------------------------------------------------------------*/
-
-var dayIDs = ['sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat'],
-	DAY_MS = 86400000,
-	HOUR_MS = 3600000,
-	MINUTE_MS = 60000;
-	
-
-function addYears(d, n, keepTime) {
-	d.setFullYear(d.getFullYear() + n);
-	if (!keepTime) {
-		clearTime(d);
-	}
-	return d;
-}
-
-
-function addMonths(d, n, keepTime) { // prevents day overflow/underflow
-	if (+d) { // prevent infinite looping on invalid dates
-		var m = d.getMonth() + n,
-			check = cloneDate(d);
-		check.setDate(1);
-		check.setMonth(m);
-		d.setMonth(m);
-		if (!keepTime) {
-			clearTime(d);
-		}
-		while (d.getMonth() != check.getMonth()) {
-			d.setDate(d.getDate() + (d < check ? 1 : -1));
-		}
-	}
-	return d;
-}
-
-
-function addDays(d, n, keepTime) { // deals with daylight savings
-	if (+d) {
-		var dd = d.getDate() + n,
-			check = cloneDate(d);
-		check.setHours(9); // set to middle of day
-		check.setDate(dd);
-		d.setDate(dd);
-		if (!keepTime) {
-			clearTime(d);
-		}
-		fixDate(d, check);
-	}
-	return d;
-}
-
-
-function fixDate(d, check) { // force d to be on check's YMD, for daylight savings purposes
-	if (+d) { // prevent infinite looping on invalid dates
-		while (d.getDate() != check.getDate()) {
-			d.setTime(+d + (d < check ? 1 : -1) * HOUR_MS);
-		}
-	}
-}
-
-
-function addMinutes(d, n) {
-	d.setMinutes(d.getMinutes() + n);
-	return d;
-}
-
-
-function clearTime(d) {
-	d.setHours(0);
-	d.setMinutes(0);
-	d.setSeconds(0); 
-	d.setMilliseconds(0);
-	return d;
-}
-
-
-function cloneDate(d, dontKeepTime) {
-	if (dontKeepTime) {
-		return clearTime(new Date(+d));
-	}
-	return new Date(+d);
-}
-
-
-function zeroDate() { // returns a Date with time 00:00:00 and dateOfMonth=1
-	var i=0, d;
-	do {
-		d = new Date(1970, i++, 1);
-	} while (d.getHours()); // != 0
-	return d;
-}
-
-
-function skipWeekend(date, inc, excl) {
-	inc = inc || 1;
-	while (!date.getDay() || (excl && date.getDay()==1 || !excl && date.getDay()==6)) {
-		addDays(date, inc);
-	}
-	return date;
-}
-
-
-function dayDiff(d1, d2) { // d1 - d2
-	return Math.round((cloneDate(d1, true) - cloneDate(d2, true)) / DAY_MS);
-}
-
-
-function setYMD(date, y, m, d) {
-	if (y !== undefined && y != date.getFullYear()) {
-		date.setDate(1);
-		date.setMonth(0);
-		date.setFullYear(y);
-	}
-	if (m !== undefined && m != date.getMonth()) {
-		date.setDate(1);
-		date.setMonth(m);
-	}
-	if (d !== undefined) {
-		date.setDate(d);
-	}
-}
-
-
-
-/* Date Parsing
------------------------------------------------------------------------------*/
-
-
-function parseDate(s, ignoreTimezone) { // ignoreTimezone defaults to true
-	if (typeof s == 'object') { // already a Date object
-		return s;
-	}
-	if (typeof s == 'number') { // a UNIX timestamp
-		return new Date(s * 1000);
-	}
-	if (typeof s == 'string') {
-		if (s.match(/^\d+(\.\d+)?$/)) { // a UNIX timestamp
-			return new Date(parseFloat(s) * 1000);
-		}
-		if (ignoreTimezone === undefined) {
-			ignoreTimezone = true;
-		}
-		return parseISO8601(s, ignoreTimezone) || (s ? new Date(s) : null);
-	}
-	// TODO: never return invalid dates (like from new Date(<string>)), return null instead
-	return null;
-}
-
-
-function parseISO8601(s, ignoreTimezone) { // ignoreTimezone defaults to false
-	// derived from http://delete.me.uk/2005/03/iso8601.html
-	// TODO: for a know glitch/feature, read tests/issue_206_parseDate_dst.html
-	var m = s.match(/^([0-9]{4})(-([0-9]{2})(-([0-9]{2})([T ]([0-9]{2}):([0-9]{2})(:([0-9]{2})(\.([0-9]+))?)?(Z|(([-+])([0-9]{2})(:?([0-9]{2}))?))?)?)?)?$/);
-	if (!m) {
-		return null;
-	}
-	var date = new Date(m[1], 0, 1);
-	if (ignoreTimezone || !m[14]) {
-		var check = new Date(m[1], 0, 1, 9, 0);
-		if (m[3]) {
-			date.setMonth(m[3] - 1);
-			check.setMonth(m[3] - 1);
-		}
-		if (m[5]) {
-			date.setDate(m[5]);
-			check.setDate(m[5]);
-		}
-		fixDate(date, check);
-		if (m[7]) {
-			date.setHours(m[7]);
-		}
-		if (m[8]) {
-			date.setMinutes(m[8]);
-		}
-		if (m[10]) {
-			date.setSeconds(m[10]);
-		}
-		if (m[12]) {
-			date.setMilliseconds(Number("0." + m[12]) * 1000);
-		}
-		fixDate(date, check);
-	}else{
-		date.setUTCFullYear(
-			m[1],
-			m[3] ? m[3] - 1 : 0,
-			m[5] || 1
-		);
-		date.setUTCHours(
-			m[7] || 0,
-			m[8] || 0,
-			m[10] || 0,
-			m[12] ? Number("0." + m[12]) * 1000 : 0
-		);
-		var offset = Number(m[16]) * 60 + (m[18] ? Number(m[18]) : 0);
-		offset *= m[15] == '-' ? 1 : -1;
-		date = new Date(+date + (offset * 60 * 1000));
-	}
-	return date;
-}
-
-
-function parseTime(s) { // returns minutes since start of day
-	if (typeof s == 'number') { // an hour
-		return s * 60;
-	}
-	if (typeof s == 'object') { // a Date object
-		return s.getHours() * 60 + s.getMinutes();
-	}
-	var m = s.match(/(\d+)(?::(\d+))?\s*(\w+)?/);
-	if (m) {
-		var h = parseInt(m[1], 10);
-		if (m[3]) {
-			h %= 12;
-			if (m[3].toLowerCase().charAt(0) == 'p') {
-				h += 12;
-			}
-		}
-		return h * 60 + (m[2] ? parseInt(m[2], 10) : 0);
-	}
-}
-
-
-
-/* Date Formatting
------------------------------------------------------------------------------*/
-// TODO: use same function formatDate(date, [date2], format, [options])
-
-
-function formatDate(date, format, options) {
-	return formatDates(date, null, format, options);
-}
-
-
-function formatDates(date1, date2, format, options) {
-	options = options || defaults;
-	var date = date1,
-		otherDate = date2,
-		i, len = format.length, c,
-		i2, formatter,
-		res = '';
-	for (i=0; i<len; i++) {
-		c = format.charAt(i);
-		if (c == "'") {
-			for (i2=i+1; i2<len; i2++) {
-				if (format.charAt(i2) == "'") {
-					if (date) {
-						if (i2 == i+1) {
-							res += "'";
-						}else{
-							res += format.substring(i+1, i2);
-						}
-						i = i2;
-					}
-					break;
-				}
-			}
-		}
-		else if (c == '(') {
-			for (i2=i+1; i2<len; i2++) {
-				if (format.charAt(i2) == ')') {
-					var subres = formatDate(date, format.substring(i+1, i2), options);
-					if (parseInt(subres.replace(/\D/, ''), 10)) {
-						res += subres;
-					}
-					i = i2;
-					break;
-				}
-			}
-		}
-		else if (c == '[') {
-			for (i2=i+1; i2<len; i2++) {
-				if (format.charAt(i2) == ']') {
-					var subformat = format.substring(i+1, i2);
-					var subres = formatDate(date, subformat, options);
-					if (subres != formatDate(otherDate, subformat, options)) {
-						res += subres;
-					}
-					i = i2;
-					break;
-				}
-			}
-		}
-		else if (c == '{') {
-			date = date2;
-			otherDate = date1;
-		}
-		else if (c == '}') {
-			date = date1;
-			otherDate = date2;
-		}
-		else {
-			for (i2=len; i2>i; i2--) {
-				if (formatter = dateFormatters[format.substring(i, i2)]) {
-					if (date) {
-						res += formatter(date, options);
-					}
-					i = i2 - 1;
-					break;
-				}
-			}
-			if (i2 == i) {
-				if (date) {
-					res += c;
-				}
-			}
-		}
-	}
-	return res;
-};
-
-
-var dateFormatters = {
-	s	: function(d)	{ return d.getSeconds() },
-	ss	: function(d)	{ return zeroPad(d.getSeconds()) },
-	m	: function(d)	{ return d.getMinutes() },
-	mm	: function(d)	{ return zeroPad(d.getMinutes()) },
-	h	: function(d)	{ return d.getHours() % 12 || 12 },
-	hh	: function(d)	{ return zeroPad(d.getHours() % 12 || 12) },
-	H	: function(d)	{ return d.getHours() },
-	HH	: function(d)	{ return zeroPad(d.getHours()) },
-	d	: function(d)	{ return d.getDate() },
-	dd	: function(d)	{ return zeroPad(d.getDate()) },
-	ddd	: function(d,o)	{ return o.dayNamesShort[d.getDay()] },
-	dddd: function(d,o)	{ return o.dayNames[d.getDay()] },
-	M	: function(d)	{ return d.getMonth() + 1 },
-	MM	: function(d)	{ return zeroPad(d.getMonth() + 1) },
-	MMM	: function(d,o)	{ return o.monthNamesShort[d.getMonth()] },
-	MMMM: function(d,o)	{ return o.monthNames[d.getMonth()] },
-	yy	: function(d)	{ return (d.getFullYear()+'').substring(2) },
-	yyyy: function(d)	{ return d.getFullYear() },
-	t	: function(d)	{ return d.getHours() < 12 ? 'a' : 'p' },
-	tt	: function(d)	{ return d.getHours() < 12 ? 'am' : 'pm' },
-	T	: function(d)	{ return d.getHours() < 12 ? 'A' : 'P' },
-	TT	: function(d)	{ return d.getHours() < 12 ? 'AM' : 'PM' },
-	u	: function(d)	{ return formatDate(d, "yyyy-MM-dd'T'HH:mm:ss'Z'") },
-	S	: function(d)	{
-		var date = d.getDate();
-		if (date > 10 && date < 20) {
-			return 'th';
-		}
-		return ['st', 'nd', 'rd'][date%10-1] || 'th';
-	}
-};
-
-
diff --git a/src/defaults.js b/src/defaults.js
index 9cb9982..354d609 100644
--- a/src/defaults.js
+++ b/src/defaults.js
@@ -42,10 +42,6 @@ var defaults = {
 	// locale
 	isRTL: false,
 	firstDay: 0,
-	monthNames: ['January','February','March','April','May','June','July','August','September','October','November','December'],
-	monthNamesShort: ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'],
-	dayNames: ['Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'],
-	dayNamesShort: ['Sun','Mon','Tue','Wed','Thu','Fri','Sat'],
 	buttonText: {
 		prev: '&nbsp;&#9668;&nbsp;',
 		next: '&nbsp;&#9658;&nbsp;',
diff --git a/src/gcal/gcal.js b/src/gcal/gcal.js
index 55b5b10..d1c86dd 100644
--- a/src/gcal/gcal.js
+++ b/src/gcal/gcal.js
@@ -13,9 +13,7 @@
 
 
 var fc = $.fullCalendar;
-var formatDate = fc.formatDate;
-var parseISO8601 = fc.parseISO8601;
-var addDays = fc.addDays;
+var parseDate = fc.parseDate;
 var applyAll = fc.applyAll;
 
 
@@ -42,8 +40,8 @@ function transformOptions(sourceOptions, start, end) {
 
 	var success = sourceOptions.success;
 	var data = $.extend({}, sourceOptions.data || {}, {
-		'start-min': formatDate(start, 'u'),
-		'start-max': formatDate(end, 'u'),
+		'start-min': start.toString('u'),
+		'start-max': end.toString('u'),
 		'singleevents': true,
 		'max-results': 9999
 	});
@@ -64,8 +62,8 @@ function transformOptions(sourceOptions, start, end) {
 			if (data.feed.entry) {
 				$.each(data.feed.entry, function(i, entry) {
 					var startStr = entry['gd$when'][0]['startTime'];
-					var start = parseISO8601(startStr, true);
-					var end = parseISO8601(entry['gd$when'][0]['endTime'], true);
+					var start = parseDate(startStr, true); // true for ignoreTimezone
+					var end = parseDate(entry['gd$when'][0]['endTime'], true); // true for ignoreTimezone
 					var allDay = startStr.indexOf('T') == -1;
 					var url;
 					$.each(entry.link, function(i, link) {
@@ -77,7 +75,7 @@ function transformOptions(sourceOptions, start, end) {
 						}
 					});
 					if (allDay) {
-						addDays(end, -1); // make inclusive
+						end.addDays(-1); // make inclusive
 					}
 					events.push({
 						id: entry['gCal$uid']['value'],
diff --git a/src/mightydate.js b/src/mightydate.js
new file mode 100644
index 0000000..4ef0b02
--- /dev/null
+++ b/src/mightydate.js
@@ -0,0 +1,795 @@
+/**
+ * @preserve MightyDate v0.4
+ * http://github.com/arshaw/mightydate
+ *
+ * Copyright 2011, Adam Shaw
+ * Dual licensed under the MIT or GPL Version 2 licenses.
+ *
+ * Date: Sun May 8 00:19:07 2011 -0700
+ */
+
+
+var MightyDate = (function(Date, undefined) {
+
+
+/** @const */ var FULLYEAR_INDEX     = 0;
+/** @const */ var MONTH_INDEX        = 1;
+/** @const */ var DATE_INDEX         = 2;
+/** @const */ var HOURS_INDEX        = 3;
+/** @const */ var MINUTES_INDEX      = 4;
+/** @const */ var SECONDS_INDEX      = 5;
+/** @const */ var MILLISECONDS_INDEX = 6;
+/** @const */ var DAY_INDEX          = 7;
+/** @const */ var YEAR_INDEX         = 8;
+/** @const */ var WEEK_INDEX         = 9;
+
+/** @const */ var DAY_MS = 86400000;
+
+var methodSubjects = [
+	'FullYear',     // 0
+	'Month',        // 1
+	'Date',         // 2
+	'Hours',        // 3
+	'Minutes',      // 4
+	'Seconds',      // 5
+	'Milliseconds', // 6
+	'Day',          // 7
+	'Year'          // 8
+];
+var subjectPlurals = [
+	'Years',        // 0
+	'Months',       // 1
+	'Days'          // 2
+];
+var otherGetters = [
+	'getTimezoneOffset',
+	'getTime',
+	'valueOf',
+	'toDateString',
+	'toTimeString',
+	'toLocaleString',
+	'toLocaleDateString',
+	'toLocaleTimeString',
+	'toJSON'
+];
+var formatStringRE = new RegExp(
+	"(" +                                             // 1
+	"\\((" + "('.*?'|\\(.*?\\)|.)*?" + ")\\)" + "|" + // 2 3
+	"\\{(" + "('.*?'|.)*?"           + ")\\}" + "|" + // 4 5
+	"\\[(" + "('.*?'|.)*?"           + ")\\]" + "|" + // 6 7
+	"'(.*?)'"                                 + "|" + // 8
+	"(.[^({[']*)" +                                   // 9
+	")" +
+	"(.*)" // 10
+);
+var UTC = Date.UTC;
+var proto = MightyDate.prototype;
+var i;
+var noopSignal = {};
+
+
+
+/* Constructor
+------------------------------------------------------------------------------*/
+
+
+function MightyDate() {
+	if (!(this instanceof MightyDate)) {
+		// when MightyDate is called as a method. TODO: write test
+		return init(new MightyDate(noopSignal), arguments);
+	}
+	init(this, arguments);
+}
+
+
+function init(mightyDate, args) {
+	var len = args.length;
+	if (!len) {
+		// set to now
+		setLocalDate(mightyDate, new Date());
+	}
+	else if (len == 1) {
+		var arg = args[0];
+		if (isNumber(arg)) {
+			setLocalDate(mightyDate, new Date(arg));
+		}
+		else if (isString(arg)) {
+			_setUniversalDate(mightyDate, new Date(0));
+			parse(mightyDate, arg);
+		}
+		else if (arg instanceof Date) {
+			setLocalDate(mightyDate, new Date(+arg));
+		}
+		else if (arg instanceof MightyDate) {
+			_setUniversalDate(mightyDate, new Date(+getUniversalDate(arg)));
+		}
+		else if (arg != noopSignal) {
+			_setUniversalDate(mightyDate, NaN); // make it an Invalid Date. TODO: write test
+		}
+	}
+	else {
+		_setUniversalDate(mightyDate, new Date(UTC.apply(Date, args)));
+	}
+	return mightyDate;
+}
+
+
+
+/* Standard Methods + Adding/Diffing Methods
+-----------------------------------------------------------------------------*/
+
+
+for (i=0; i<WEEK_INDEX; i++) (function(subject, i) { // TODO: rename i to fieldIndex
+
+	if (i != YEAR_INDEX) { // there is no getUTCYear
+	
+		// getFullYear
+		// getMonth
+		// getDate
+		// getHours
+		// getMinutes
+		// getSeconds
+		// getMilliseconds
+		// getDay
+		proto['get' + subject] = function() {
+			return getUniversalDate(this)['getUTC' + subject]();
+		};
+	
+	}
+	
+	// getFullYear
+	// getMonth
+	// getDate
+	// getHours
+	// getMinutes
+	// getSeconds
+	// getMilliseconds
+	// getDay
+	// getYear
+	proto['getUTC' + subject] = function() {
+		return getLocalDate(this)['getUTC' + subject]();
+	};
+	
+	if (i != DAY_INDEX) { // there is no setDay or setUTCDay methods
+	
+		// setFullYear
+		// setMonth
+		// setDate
+		// setHours
+		// setMinutes
+		// setSeconds
+		// setMilliseconds
+		// setYear
+		proto['set' + subject] = function(value, preventOverflow) {
+			value = parseInt(value); // TODO: write tests
+			var month = i == MONTH_INDEX ? value % 12 : this.getMonth();
+			var args = arguments;
+			if (args.length == 2 && (isBoolean(preventOverflow) || preventOverflow === undefined)) {
+				args = [value];
+			}
+			getUniversalDate(this)['setUTC' + subject].apply(
+				getUniversalDate(this),
+				args
+			);
+			clearLocalDate(this);
+			// TODO: write tests for year overflow
+			if (i < DATE_INDEX && preventOverflow === true && this.getMonth() != month) { // fullyear or month
+				this.addMonths(-1)
+					.setDate(
+						getDaysInMonth(this.getFullYear(), this.getMonth())
+					);
+			}
+			return this; // for chaining
+		};
+	
+		if (i != YEAR_INDEX) { // there is no setUTCYear method
+	
+			// setUTCFullYear
+			// setUTCMonth
+			// setUTCDate
+			// setUTCHours
+			// setUTCMinutes
+			// setUTCMilliseconds
+			proto['setUTC' + subject] = function() {
+				var localDate = getLocalDate(this);
+				localDate['setUTC' + subject].apply(
+					localDate,
+					arguments
+				);
+				setUniversalDate(this, localToUniversal(localDate));
+				return this; // for chaining
+			};
+	
+		}
+	
+	}
+	
+	if (i < DAY_INDEX) { // not day and not year
+	
+		// addYears
+		// addMonths
+		// addDays
+		// addHours
+		// addMinutes
+		// addSeconds
+		// addMilliseconds
+		proto['add' + (subjectPlurals[i] || subject)] = function(delta, preventOverflow) {
+			delta = parseInt(delta);
+			this['set' + subject](
+				this['get' + subject]() + delta,
+				preventOverflow
+			);
+			return this; // for chaining
+		};
+		
+		// diffYears
+		// diffMonths
+		// diffDays
+		// diffHours
+		// diffMinutes
+		// diffSeconds
+		// diffMilliseconds
+		proto['diff' + (subjectPlurals[i] || subject)] = function(otherDate, exact) {
+			return diff(i, this, otherDate, exact);
+		};
+	
+	}
+
+})(methodSubjects[i], i);
+
+
+for (i=0; i<otherGetters.length; i++) (function(getter) {
+
+	proto[getter] = function() {
+		return getLocalDate(this)[getter]();
+	};
+
+})(otherGetters[i]);
+
+
+proto.getYear = function() {
+	return getUniversalDate(this).getUTCFullYear() - 1900;
+};
+
+
+proto.setTime = function(t) {
+	setLocalDate(this, new Date(t));
+};
+
+
+function diff(fieldIndex, date, otherDate, exact) { // TODO: write tests
+	var d1 = getUniversalDate(date);
+	var d2 = extractUniversalDate(otherDate);
+	var v;
+	if (fieldIndex < DATE_INDEX) { // fullyear or month
+		v = (d2.getUTCFullYear() * 12 + d2.getUTCMonth()) - 
+			(d1.getUTCFullYear() * 12 + d1.getUTCMonth()) +
+			((d2 - UTC(d2.getUTCFullYear(), d2.getUTCMonth(), 1)) -
+			 (d1 - UTC(d1.getUTCFullYear(), d1.getUTCMonth(), 1))) / DAY_MS / 31;
+		if (fieldIndex == FULLYEAR_INDEX) {
+			v /= 12;
+		}
+	}else{
+		v = (d2 - d1) / [ // milliseconds in a...
+			DAY_MS,  // day
+			3600000, // hour
+			60000,   // minute
+			1000,    // second
+			1,       // millisecond
+			0,
+			0,
+			DAY_MS * 7 // week
+			][fieldIndex - 2];
+	}
+	if (!exact) {
+		v = Math.floor(v);
+	}
+	return v;
+}
+
+
+
+/* Week (TODO: write tests)
+----------------------------------------------------------------------------*/
+
+
+proto.diffWeeks = function(otherDate, exact) {
+	return diff(WEEK_INDEX, this, otherDate, exact);
+};
+
+
+proto.addWeeks = function(delta) {
+	return this.addDays(delta * 7);
+};
+
+
+proto.getWeek = function(d) {
+	return _getWeek(this.getFullYear(), this.getMonth(), this.getDate());
+};
+
+
+proto.getUTCWeek = function(d) {
+	return _getWeek(this.getUTCFullYear(), this.getUTCMonth(), this.getUTCDate());
+};
+
+
+function _getWeek(year, month, date) {
+	var d = new Date(UTC(year, month, date));
+	var currentWeek1 = getWeek1(year);
+	var week1 = currentWeek1;
+	if (d < currentWeek1) {
+		week1 = getWeek1(year-1);
+	}else{
+		var nextWeek1 = getWeek1(year+1);
+		if (d >= nextWeek1) {
+			week1 = nextWeek1;
+		}
+	}
+	return Math.floor(Math.round((d - week1) / DAY_MS) / 7) + 1;
+}
+
+
+function getWeek1(year) {
+	var d = new Date(UTC(year, 0, 4));
+	d.setUTCDate(d.getUTCDate() - (d.getUTCDay() + 6) % 7);
+	return d;
+}
+
+
+
+/* Non-Standard Methods
+-----------------------------------------------------------------------------*/
+
+
+proto.equals = function(date) {
+	return +getUniversalDate(this) == +extractUniversalDate(date);
+};
+
+
+proto.before = function(date) {
+	return getUniversalDate(this) < extractUniversalDate(date);
+};
+
+
+proto.after = function(date) {
+	return getUniversalDate(this) > extractUniversalDate(date);
+};
+
+
+proto.valid = function() {
+	return !isNaN(+getUniversalDate(this));
+};
+
+
+proto.clearTime = function() {
+	return this.setHours(0, 0, 0, 0);
+};
+
+
+proto.clone = function() {
+	return new MightyDate(this);
+};
+
+
+proto.toDate = function() {
+	return new Date(+this);
+};
+
+
+
+/* Parsing
+-----------------------------------------------------------------------------*/
+
+
+MightyDate.parsers = [
+	parseISO
+];
+
+
+MightyDate.parse = function(str) {
+	return +new MightyDate(''+str);
+};
+
+
+function parse(date, str) {
+	var parsers = MightyDate.parsers;
+	for (var i=0; i<parsers.length; i++) {
+		if (parsers[i](date, str)) {
+			return;
+		}
+	}
+	setLocalDate(date, new Date(str));
+}
+
+
+function parseISO(date, str) {
+	var m = str.match(/^(\d{4})(-(\d{2})(-(\d{2})([T ](\d{2}):(\d{2})(:(\d{2})(\.(\d+))?)?(Z|(([-+])(\d{2})(:?(\d{2}))?))?)?)?)?$/);
+	if (!m) {
+		return false;
+	}
+	var args1 = [
+		m[1],
+		m[3] ? m[3] - 1 : 0,
+		m[5] || 1
+	];
+	var args2 = [
+		m[7] || 0,
+		m[8] || 0,
+		m[10] || 0,
+		m[12] ? Number('0.' + m[12]) * 1000 : 0
+	];
+	if (m[14]) {
+		date.setUTCFullYear.apply(date, args1);
+		date.setUTCHours.apply(date, args2);
+		var offset = Number(m[16]) * 60 + (m[18] ? Number(m[18]) : 0);
+		offset *= m[15] == '-' ? 1 : -1;
+		date.addMinutes(offset);
+	}else{
+		date.setFullYear.apply(date, args1);
+		date.setHours.apply(date, args2);
+	}
+	return true;
+}
+
+
+
+/* Formatting
+---------------------------------------------------------------------------------------*/
+
+
+MightyDate.defaultLocale = '';
+MightyDate.locales = {
+	'': {
+		monthNames: ['January','February','March','April','May','June','July','August','September','October','November','December'],
+		monthNamesShort: ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'],
+		dayNames: ['Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'],
+		dayNamesShort: ['Sun','Mon','Tue','Wed','Thu','Fri','Sat'],
+		amDesignator: 'AM',
+		pmDesignator: 'PM'
+	}
+};
+
+
+MightyDate.formatters = {
+	i: "yyyy-MM-dd'T'HH:mm:ss",
+	u: "yyyy-MM-dd'T'HH:mm:ssK"
+};
+
+
+proto.toString = function(otherDate, formatString, settings) {
+	if (!arguments.length || !this.valid()) {
+		return getLocalDate(this).toString();
+	}
+	return format(false, this, otherDate, formatString, settings);
+};
+
+
+proto.toUTCString = proto.toGMTString = function(otherDate, formatString, settings) {
+	if (!arguments.length || !this.valid()) {
+		return getLocalDate(this).toUTCString();
+	}
+	return format(true, this, otherDate, formatString, settings);
+};
+
+
+function format(isUTC, date, otherDate, formatString, settings) {
+
+	if (isString(otherDate)) {
+		settings = formatString;
+		formatString = otherDate;
+		otherDate = null;
+	}
+	
+	var locales = MightyDate.locales;
+	var localeSettings = locales[MightyDate.defaultLocale] || {};
+	if (isString(settings)) {
+		localeSettings = locales[settings] || localeSettings;
+		settings = {};
+	}else{
+		settings = settings || {};
+	}
+	
+	function getSetting(name) {
+		return settings[name] || localeSettings[name];
+	}
+	
+	return _format(isUTC, date, otherDate, formatString, getSetting);
+}
+
+
+function _format(isUTC, date, otherDate, formatString, getSetting, uniqueness) {
+
+	var match;
+	var tokenReplacement;
+	var subOutput;
+	var output = '';
+	var _getField = isUTC ? getUTCField : getLocalField;
+	
+	function getField(i) {
+		if (uniqueness) {
+			for (var j=i; j>=0; j--) {
+				uniqueness.push(_getField(date, j));
+			}
+		}
+		return _getField(date, i);
+	}
+	
+	while (formatString) {
+		match = formatStringRE.exec(formatString);
+		if (match[9] !== undefined) {
+			// tokens
+			var tokenSoup = match[9];
+			var tokenSoupLength = tokenSoup.length;
+			var tokenStart = 0;
+			var tokenEnd = tokenSoupLength;
+			while (tokenStart < tokenSoupLength) {
+				tokenReplacement = undefined;
+				// find the longest formatter starting at tokenStart
+				while (tokenEnd > tokenStart) {
+					tokenReplacement = getTokenReplacement(
+						tokenSoup.substring(tokenStart, tokenEnd), // the potential token
+						isUTC, date, getField, getSetting, uniqueness
+					);
+					if (tokenReplacement !== undefined) {
+						output += tokenReplacement;
+						tokenStart = tokenEnd; // continue looking after
+						break;
+					}
+					tokenEnd--;
+				}
+				if (tokenReplacement === undefined) {
+					// swallow single character and continue after
+					output += formatString.charAt(tokenStart);
+					tokenStart++;
+				}
+				tokenEnd = tokenSoupLength;
+			}
+		}
+		else if (match[2] !== undefined) {
+			// only if non-zero
+			subOutput = _format(isUTC, date, otherDate, match[2], getSetting);
+			if (Number(subOutput.replace(/\D/g, ''))) {
+				output += subOutput;
+			}
+		}
+		else if (match[4] !== undefined) {
+			// switch to other date
+			if (otherDate) {
+				output += _format(isUTC, otherDate, date, match[4], getSetting);
+			}
+		}
+		else if (match[6] !== undefined) {
+			// only if different
+			var otherSubUniqueness = [];
+			var otherSubOutput = _format(isUTC, otherDate, date, match[6], getSetting, otherSubUniqueness);
+			var subUniqueness = [];
+			subOutput = _format(isUTC, date, otherDate, match[6], getSetting, subUniqueness);
+			if (subOutput != otherSubOutput || subUniqueness.join() != otherSubUniqueness.join()) {
+				output += subOutput;
+			}
+		}
+		else if (match[8] !== undefined) {
+			if (match[8]) {
+				output += match[8]; // quoted text
+			}else{
+				output += "'"; // escaped quote
+			}
+		}
+		formatString = match[10];
+	}
+	
+	return output;
+}
+
+
+function getTokenReplacement(token, isUTC, date, getField, getSetting, uniqueness) {
+	var formatter = MightyDate.formatters[token];
+	if (formatter) {
+		if (isString(formatter)) {
+			return _format(isUTC, date, null, formatter, getSetting, uniqueness);
+		}
+		return formatter(date, getSetting, isUTC);
+	}
+	switch (token) {
+		case 's'    : return getField(SECONDS_INDEX);
+		case 'ss'   : return zeroPad(getField(SECONDS_INDEX));
+		case 'm'    : return getField(MINUTES_INDEX);
+		case 'mm'   : return zeroPad(getField(MINUTES_INDEX));
+		case 'h'    : return getField(HOURS_INDEX) % 12 || 12;
+		case 'hh'   : return zeroPad(getField(HOURS_INDEX) % 12 || 12);
+		case 'H'    : return getField(HOURS_INDEX);
+		case 'HH'   : return zeroPad(getField(HOURS_INDEX));
+		case 'd'    : return getField(DATE_INDEX);
+		case 'dd'   : return zeroPad(getField(DATE_INDEX));
+		case 'ddd'  : return getSetting('dayNamesShort')[getField(DAY_INDEX)];
+		case 'dddd' : return getSetting('dayNames')[getField(DAY_INDEX)];
+		case 'M'    : return getField(MONTH_INDEX) + 1;
+		case 'MM'   : return zeroPad(getField(MONTH_INDEX) + 1);
+		case 'MMM'  : return getSetting('monthNamesShort')[getField(MONTH_INDEX)];
+		case 'MMMM' : return getSetting('monthNames')[getField(MONTH_INDEX)];
+		case 'yy'   : return (getField(FULLYEAR_INDEX)+'').substring(2);
+		case 'yyyy' : return getField(FULLYEAR_INDEX);
+		case 't'    :
+		case 'tt'   :
+		case 'T'    :
+		case 'TT'   :
+			var s = getField(HOURS_INDEX) < 12 ? getSetting('amDesignator') : getSetting('pmDesignator');
+			if (token.length == 1) s = s.substr(0, 1);
+			if (token > 'TT') s = s.toLowerCase(); // token == 't' || token == 'tt'
+			return s;
+		case 'K'    : if (isUTC) return 'Z';
+		case 'z'    :
+		case 'zz'   :
+		case 'zzz'  :
+			var tzo = date.getTimezoneOffset();
+			var sign = tzo < 0 ? '+' : '-';
+			var hours = Math.floor((tzo = Math.abs(tzo)) / 60);
+			var minutes = tzo % 60;
+			return sign + 
+				(token == 'z' ? hours : zeroPad(hours)) +
+				((token == 'z' || token == 'zz') ? '' : ':' + zeroPad(minutes));
+		case 'S'    :
+			var d = getField(DATE_INDEX);
+			if (d > 10 && d < 20) return 'th';
+			return ['st', 'nd', 'rd'][d % 10 - 1] || 'th';
+		case 'W'    :
+			return _getWeek(
+				getField(FULLYEAR_INDEX),
+				getField(MONTH_INDEX),
+				getField(DATE_INDEX)
+			);
+		case 'WW'    :
+			return zeroPad(
+				_getWeek(
+					getField(FULLYEAR_INDEX),
+					getField(MONTH_INDEX),
+					getField(DATE_INDEX)
+				)
+			);
+	}
+}
+
+
+function getLocalField(date, i) {
+	return date['get' + methodSubjects[i]]();
+}
+
+
+function getUTCField(date, i) {
+	return date['getUTC' + methodSubjects[i]]();
+}
+
+
+
+/* Misc Class Methods
+-----------------------------------------------------------------------------*/
+
+
+MightyDate.now = Date.now;
+
+
+MightyDate.UTC = UTC;
+
+
+MightyDate.getDaysInMonth = getDaysInMonth;
+
+
+
+/* Date Utilities
+--------------------------------------------------------------------------------*/
+
+
+function getDaysInMonth(year, month) {
+	return 32 - new Date(Date.UTC(year, month, 32)).getUTCDate();
+}
+
+
+function extractUniversalDate(date) {
+	if (date instanceof MightyDate) {
+		return getUniversalDate(date);
+	}
+	else if (date instanceof Date) {
+		return localToUniversal(date);
+	}
+	return getUniversalDate(new MightyDate(date));
+}
+
+
+function localToUniversal(localDate) {
+	return new Date(UTC(
+		localDate.getFullYear(),
+		localDate.getMonth(),
+		localDate.getDate(),
+		localDate.getHours(),
+		localDate.getMinutes(),
+		localDate.getSeconds(),
+		localDate.getMilliseconds()
+	));
+}
+
+
+function universalToLocal(universalDate) {
+	return new Date(
+		universalDate.getUTCFullYear(),
+		universalDate.getUTCMonth(),
+		universalDate.getUTCDate(),
+		universalDate.getUTCHours(),
+		universalDate.getUTCMinutes(),
+		universalDate.getUTCSeconds(),
+		universalDate.getUTCMilliseconds()
+	);
+}
+
+
+
+/* General Utilities
+--------------------------------------------------------------------------------*/
+
+
+function zeroPad(n) {
+	return (n < 10 ? '0' : '') + n;
+}
+
+
+function isString(x) {
+	return typeof x == 'string';
+}
+
+
+function isNumber(x) {
+	return typeof x == 'number';
+}
+
+
+function isBoolean(x) {
+	return typeof x == 'boolean';
+}
+
+
+
+/* Internal Utilities
+---------------------------------------------------------------------------------*/
+
+// _ is universal date
+// $ is local date
+
+
+function getUniversalDate(mightyDate) {
+	return mightyDate._;
+}
+
+
+function setUniversalDate(mightyDate, universalDate) {
+	_setUniversalDate(mightyDate, universalDate);
+	clearLocalDate(mightyDate);
+}
+
+
+function _setUniversalDate(mightyDate, universalDate) {
+	mightyDate._ = universalDate;
+}
+
+
+function getLocalDate(mightyDate) {
+	if (mightyDate.$ === undefined) {
+		mightyDate.$ = universalToLocal(mightyDate._);
+	}
+	return mightyDate.$;
+}
+
+
+function setLocalDate(mightyDate, localDate) {
+	mightyDate.$ = localDate;
+	mightyDate._ = localToUniversal(localDate);
+}
+
+
+function clearLocalDate(mightyDate) {
+	delete mightyDate.$;
+}
+
+
+
+return MightyDate;
+
+})(Date);
diff --git a/src/util.js b/src/util.js
index b16f064..54941ff 100644
--- a/src/util.js
+++ b/src/util.js
@@ -1,5 +1,85 @@
 
 fc.applyAll = applyAll;
+fc.Date = MightyDate;
+fc.parseDate = parseDate;
+fc.parseISO8601 = parseISO8601;
+fc.formatDate = formatDate;
+fc.formatDates = formatDates;
+
+
+var dayIDs = ['sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat'];
+
+
+/* Date
+--------------------------------------------------------------------------------*/
+
+
+function skipWeekend(date, inc, excl) {
+	inc = inc || 1;
+	while (!date.getDay() || (excl && date.getDay()==1 || !excl && date.getDay()==6)) {
+		date.addDays(inc);
+	}
+	return date;
+}
+
+
+function parseTime(s) { // returns minutes since start of day
+	if (typeof s == 'number') { // an hour
+		return s * 60;
+	}
+	if (typeof s == 'object') { // a Date object
+		return s.getHours() * 60 + s.getMinutes();
+	}
+	var m = s.match(/(\d+)(?::(\d+))?\s*(\w+)?/);
+	if (m) {
+		var h = parseInt(m[1], 10);
+		if (m[3]) {
+			h %= 12;
+			if (m[3].toLowerCase().charAt(0) == 'p') {
+				h += 12;
+			}
+		}
+		return h * 60 + (m[2] ? parseInt(m[2], 10) : 0);
+	}
+}
+
+
+// TODO: change ignoreTimezone default
+function parseDate(input, ignoreTimezone) { // ignoreTimezone DEFAULTS TO TRUE!!! :(
+	// handles more than just strings
+	if (ignoreTimezone === undefined) {
+		ignoreTimezone = true;
+	}
+	if (ignoreTimezone && typeof input == 'string') {
+		input = stripTimezone(input);
+	}
+	return new MightyDate(input);
+}
+
+
+// TODO: deprecate
+function parseISO8601(input, ignoreTimezone) { // ignoreTimezone DEFAULTS TO FALSE
+	if (ignoreTimezone === undefined) {
+		ignoreTimezone = false;
+	}
+	return parseDate(input, ignoreTimezone);
+}
+
+
+function stripTimezone(s) {
+	return s.replace(/^(\d{4}-\d{2}-\d{2}[T ]\d{2}:\d{2}:\d{2}(\.\d+)?)(.*)$/, '$1');
+}
+
+
+function formatDate(date, formatString, settings) {
+	return new MightyDate(date).toString(formatString, settings);
+}
+
+
+function formatDates(date1, date2, formatString, settings) {
+	return new MightyDate(date1).toString(date2, formatString, settings);
+}
+
 
 
 /* Event Date Math
@@ -10,24 +90,27 @@ function exclEndDay(event) {
 	if (event.end) {
 		return _exclEndDay(event.end, event.allDay);
 	}else{
-		return addDays(cloneDate(event.start), 1);
+		return event.start.clone().addDays(1).clearTime();
 	}
 }
 
 
 function _exclEndDay(end, allDay) {
-	end = cloneDate(end);
-	return allDay || end.getHours() || end.getMinutes() ? addDays(end, 1) : clearTime(end);
+	end = end.clone();
+	if (allDay || end.getHours() || end.getMinutes()) {
+		end.addDays(1);
+	}
+	return end.clearTime();
 }
 
 
 function segCmp(a, b) {
-	return (b.msLength - a.msLength) * 100 + (a.event.start - b.event.start);
+	return (b.msLength - a.msLength) * 100 + b.event.start.diffMilliseconds(a.event.start);
 }
 
 
 function segsCollide(seg1, seg2) {
-	return seg1.end > seg2.start && seg1.start < seg2.end;
+	return seg1.end.after(seg2.start) && seg1.start.before(seg2.end);
 }
 
 
@@ -47,16 +130,16 @@ function sliceSegs(events, visEventEnds, start, end) {
 		event = events[i];
 		eventStart = event.start;
 		eventEnd = visEventEnds[i];
-		if (eventEnd > start && eventStart < end) {
-			if (eventStart < start) {
-				segStart = cloneDate(start);
+		if (eventEnd.after(start) && eventStart.before(end)) {
+			if (eventStart.before(start)) {
+				segStart = start.clone();
 				isStart = false;
 			}else{
 				segStart = eventStart;
 				isStart = true;
 			}
-			if (eventEnd > end) {
-				segEnd = cloneDate(end);
+			if (eventEnd.after(end)) {
+				segEnd = end.clone();
 				isEnd = false;
 			}else{
 				segEnd = eventEnd;
@@ -68,7 +151,7 @@ function sliceSegs(events, visEventEnds, start, end) {
 				end: segEnd,
 				isStart: isStart,
 				isEnd: isEnd,
-				msLength: segEnd - segStart
+				msLength: segStart.diffMilliseconds(segEnd)
 			});
 		}
 	}