method

prev_occurring

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What's this?

prev_occurring(day_of_week) public

Returns a new date/time representing the previous occurrence of the specified day of week.

today = Date.today               # => Thu, 14 Dec 2017
today.prev_occurring(:monday)    # => Mon, 11 Dec 2017
today.prev_occurring(:thursday)  # => Thu, 07 Dec 2017

Show source

# File activesupport/lib/active_support/core_ext/date_and_time/calculations.rb, line 350
    def prev_occurring(day_of_week)
      current_day_number = wday != 0 ? wday - 1 : 6
      ago = current_day_number - DAYS_INTO_WEEK.fetch(day_of_week)
      ago += 7 unless ago > 0
      advance(days: -ago)
    end

prev_occurring

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