Created
January 20, 2012 15:37
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特定基準日の開始日を求める
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| require 'active_support' | |
| require 'active_support/core_ext' | |
| def my_start_of_month(today, base) | |
| today.prev_month.change(:day => base) | |
| end | |
| my_start_of_month(Date.today, 28) # => 2012年1月21日に実行した場合、 Wed, 28 Dec 2011 が返る |
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