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iGEL/gist:3137210

Created July 18, 2012 16:12
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Get a Date (the Monday) of a given ISO 8601 week by it's week number in Ruby
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gistfile1.rb
class Date
# Returns the monday of the given week number
def self.by_iso_weekno(year, weekno)
# January 4th is always in the first week according to ISO 8601
date = Date.civil(year, 1, 4) + (weekno - 1) * 7
date - (date.wday != 0 ? date.wday - 1 : 6) % 7
end
end
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