Created
September 3, 2013 08:12
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次の○曜日の日付を取りたい〜 ref: http://qiita.com/ppworks/items/001ee7f6b6de31dc8d33
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| Time.current.beginning_of_week(:friday).since(1.week) |
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| Time.parse('2013-09-02').beginning_of_week(:friday).since(1.week) | |
| # => 2013-09-06 00:00:00 +0900 |
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| Time.parse('2013-09-06').beginning_of_week(:friday).since(1.week) | |
| # => 2013-09-13 00:00:00 +0900 |
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