From: | James Cloos <cloos(at)jhcloos(dot)com> |
---|---|
To: | Steve Crawford <scrawford(at)pinpointresearch(dot)com> |
Cc: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>, "pgsql-general\(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: now() vs 'epoch'::timestamp |
Date: | 2015-04-02 18:33:48 |
Message-ID: | m3vbhecrcj.fsf@carbon.jhcloos.org |
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Thread: | |
Lists: | pgsql-general |
>>>>> "SC" == Steve Crawford <scrawford(at)pinpointresearch(dot)com> writes:
SC> select (now() - (now() - 'epoch')) ;
SC> ?column?
SC> ------------------------
SC> 1969-12-31 17:00:00-08
My servers all run in UTC, so that query works here.
The first query where I noticed this, I had just run date +%s and used
that value in now() - 1427998368::reltime, like:
One term:
:; date +%s
1427998617
Other term:
cloos=# select now() - 1427998617::reltime;
?column?
-------------------------------
1970-01-01 06:00:03.137866+00
(As you can see it took me 3 seconds to do the copy-paste...:)
For now()-'epoch' I get the format:
16527 days 18:27:01.688195
but for 1427999266::reltime I get:
45 years 3 mons 1 day 12:27:46
I wonder whether the YMD to D conversion takes into account the actual
number of Bissextile years?
If so, I guess that is another nail in reltime's coffin.
now() - to_timestamp(1427999266) worked correctly, but that is not
unexpected given to_timestamp's definition.
-JimC
--
James Cloos <cloos(at)jhcloos(dot)com> OpenPGP: 0x997A9F17ED7DAEA6
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