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Rails nth weekday

/ Published in: Ruby
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  1. require "date"
  2. require "date2"
  3.  
  4. class DateCalc
  5.  
  6.   ######################################################
  7.   # Returns the date for a specified day on a numbered
  8.   # week as a date object. Such as finding the 3rd Wed 
  9.   # in March, 2006.
  10.   # 
  11.   #   example: nth_weekday(2005,1,2,0)
  12.   #   (2nd Sunday in January 2005) -> Jan 8th, 2005
  13.   #
  14.   # Returns: Date object  
  15.   ######################################################
  16.   def nth_weekday(year,month,week,day)
  17.     test_date = Date.new(year,month,1)
  18.     last_day = Date.new(test_date.year, test_date.month, -1).day
  19.     first_weekday = test_date.wday
  20.     offset = first_weekday - (day % 7)
  21.     weeks = (last_day) / 7
  22.     test_date + (week * 7) - offset
  23.   end
  24.  
  25. end

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