How to calculate Good Friday in Ruby

Does anyone know how to calculate the date of Good Friday in 开发者_开发问答Ruby? Thanks.

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You may use a gem.

I use http://rubygems.org/gems/holidays (calculates also national holidays) Really a nice gem.

There are also:

• http://rubygems.org/gems/greek_easter
• http://rubygems.org/gems/date_easter
• http://rubygems.org/gems/when_easter

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Yes - this has been the most important algorithm of the Western civilization for several centuries. See e.g. Wikipedia's article on computus (calculation of the date of Easter): http://en.wikipedia.org/wiki/Computus#Algorithms . Should be trivially portable to most languages.