ruby - How can I find the dates for the same week a year ago? -


this example of week, sunday saturday:

11/21/2010 - 11/27/2010

i find dates same week sunday-saturday, last year.

require 'date' # included in ruby's standard library, no gem needed = date.today before = date.civil( now.year-1, now.month, now.day ) sunday = date.commercial( before.year, before.cweek, 1 ) - 1 # day 1 monday this_week_last_year = sunday..(sunday+6)

edit: though date.commercial cool, it's not needed. here's simpler way find sunday starting week:

require 'date'    = date.today before = date.civil( now.year-1, now.month, now.day ) sunday = before - before.wday

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