Re: [BUGS] BUG #14632: Plus and minus operators inconsistency withleap years and year intervals.

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От David G. Johnston
Тема Re: [BUGS] BUG #14632: Plus and minus operators inconsistency withleap years and year intervals.
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Msg-id CAKFQuwaoQLk4TBTjO1Mz8F3V+=z5UCG6116mOHjdGS0B_C7BOg@mail.gmail.com
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Ответ на Re: [BUGS] BUG #14632: Plus and minus operators inconsistency withleap years and year intervals.  (John R Pierce <pierce@hogranch.com>)
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On Wed, Apr 26, 2017 at 1:53 PM, John R Pierce <pierce@hogranch.com> wrote:
On 4/26/2017 1:30 PM, Pietro Pugni wrote:
Adding 10 years to 1912-02-29 returns 1922-02-29, as expected.
I would like to apply the reverse operation. To do so, I subtract 10 years from 1922-02-29 but I obtain 1912-02-28, so the math is actually wrong.


assuming 1922 was a leap year, 1912 is NOT a leap year, so therefore there is no 1912-02-29, that is an invalid date.


​PostgreSQL think 1912 is the leap year, 1922 is not...

Dave
​

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