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uiur/gist:bbd17568350f62d23264

Last active August 29, 2015 14:00
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gistfile1.txt
% rails c
Loading development environment (Rails 4.1.0)
irb(main):001:0> 1.month.ago + 1.month + 1.day
=> Thu, 01 May 2014 06:25:34 UTC +00:00
irb(main):002:0> 1.month.ago + 1.day + 1.month
=> Wed, 30 Apr 2014 06:25:47 UTC +00:00
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uiur commented Apr 30, 2014

なるほど、こういうことか

3/30 -(1.month)-> 4/30 -(1.day)-> 5/1
3/30 -(1.day)-> 3/31 -(1.month)-> 4/30

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