Re: BUG #1993: Adding/subtracting negative time intervals - Mailing list pgsql-bugs

From John R Pierce
Subject Re: BUG #1993: Adding/subtracting negative time intervals
Date
Msg-id 435F07A0.9050103@hogranch.com
Whole thread Raw
In response to Re: BUG #1993: Adding/subtracting negative time intervals  (Klint Gore <kg@kgb.une.edu.au>)
Responses Re: BUG #1993: Adding/subtracting negative time intervals
Re: BUG #1993: Adding/subtracting negative time intervals
List pgsql-bugs
>>    test=> select
>>    test-> ('2005-10-30 13:22:00-05'::timestamptz -
>>    test(>  '2005-10-29 13:22:00-04'::timestamptz);
>>     ?column?
>>    ----------
>>     25:00:00
>>    (1 row)
>
>
> Is that actually the correct answer?
>
> Disregarding daylight savings, there is 25hrs between them.  Once
> daylight savings is taken into account there should be 24 or 26 hours
> between them (southern/northern hemisphere respectively).

the whole DST thing falls apart when you deal with places that don't
respect it...  arizona (except the navajo nation), for instance....

it would be impossible to calculate the 'correct' answer without knowing
the exact location...

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