holidays/CUSTOM DATES

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= Custom dates with the Ruby Holidays Gem
It's easy to add your own custom holiday definitions to the Holidays gem. In a nutshell:
1. Build a definition file
2. Run the <tt>rake</tt> task to make a custom module
3. <tt>require</tt> your new module and enjoy!
== 1. Building the YAML file
Definition files have two main parts: *months* and *methods*. Before you start, you may want to look some of the existing files at http://code.dunae.ca/svn/holidays/trunk/data.
=== Months
Holidays are grouped by month from 1 through 12. Each entry within a month can have several fields.
[<tt>name</tt>] The name of the holiday.
[<tt>regions</tt>] One or more region codes.
===== Dates defined by a fixed date (e.g. January 1st)
[<tt>wday</tt>] Integer representing day of the month (1 through 31).
For example, the following holiday is on the first of January and available in the <tt>ca</tt>, <tt>us</tt> and <tt>au</tt> regions.
1:
- name: New Year's Day
regions: [ca,us,au]
mday: 1
===== Dates defined by a week number (e.g. first Monday of a month)
[<tt>wday</tt>] Integer representing day of the week (0 = Sunday through 6 = Saturday).
[<tt>week</tt>] Integer representing week number (1 = first week, 3 = third week, -1 = last week),
For example, the following holiday is on the first Monday of September and available in the <tt>ca</tt> region.
9:
- name: Labour Day
regions: [ca]
week: 1
wday: 1
=== Calculating dates with methods
In addition to defining holidays by day or week, you can create custom methods to calculate a date.
For example, Canada celebrates Victoria Day, which falls on the Monday on or before May 24. So, under the <tt>methods</tt> section we could create a custom method that returns a Date object.
methods:
ca_victoria_day: |
def self.ca_victoria_day(year)
date = Date.civil(year,5,24)
if date.wday > 1
date -= (date.wday - 1)
elsif date.wday == 0
date -= 6
end
date
end
This would be represented in the <tt>months</tt> section as:
5:
- name: Victoria Day
regions: [ca]
function: lambda { |year| ca_victoria_day(year) }
Functions called in this manner must return either a Date object or an integer representing the day of the month.
== 2. Building the definition module
Once you have your YAML definition file you need to generate a Ruby module using <tt>rake</tt>.
To build the module for school holidays
rake generate MyCustomDates custom.yaml
Your module can include definitions from multiple YAML files.
rake generate MyCustomDates ca.yaml us.yaml mx.yaml custom.yaml
== 3. Using your custom definitions
Your custom module is ready to use.
require 'holidays'
require 'path/to/custom'
Holidays.by_day(date, :your_region)
=== Sharing
If you've built a definition file that others might enjoy, why not share it?
Send any definition files to 'code' at 'dunae.ca'.