From: Tom Lane <tgl@sss.pgh.pa.us>
To: David G. Johnston <david.g.johnston@gmail.com>
Cc: Raj kumar <rajkumar820999@gmail.com>
Cc: Pgsql-admin <pgsql-admin@lists.postgresql.org>
Subject: Re: Conversion of a column from Integer format type to 'timestamp with time zone'
Date: Thu, 26 Jan 2023 15:10:10 -0500
Message-ID: <3165931.1674763810@sss.pgh.pa.us> (raw)
In-Reply-To: <CAKFQuwZYWsBb49OZsS=H-SDhCu2_tSFiypiX7mfbQTyAZMobWg@mail.gmail.com>
References: <CACxU--WR-nWB+gVGoTfrvYNb43HxzQNATW7HhSzkw291Qvifeg@mail.gmail.com>
<CAKFQuwZYWsBb49OZsS=H-SDhCu2_tSFiypiX7mfbQTyAZMobWg@mail.gmail.com>
"David G. Johnston" <david.g.johnston@gmail.com> writes:
> On Thu, Jan 26, 2023 at 12:45 PM Raj kumar <rajkumar820999@gmail.com> wrote:
>> Hi, there is a column 'created' in the 'customers' table which is actually
>> supposed to be a 'timestamp with time zone' column but stored in this
>> Integer format. How do I typecast this to 'timestamp with time zone' format?
>>
>> select created from customers limit 3;
>> created
>> ---------------
>> 1521521848681
>> 1508995056368
>> 1521559994299
>> (3 rows)
> We have no way of knowing what the corresponding point-in-time a 0 in that
> column represents. Or, for that matter, what a 1 means.
A plausible guess is that those are Unix timestamps expressed in
milliseconds, in which case you could do this:
=# select to_timestamp(1521521848681 / 1000.0);
to_timestamp
----------------------------
2018-03-20 00:57:28.681-04
(1 row)
But really you need to find out, not guess.
regards, tom lane
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Cc: tgl@sss.pgh.pa.us, david.g.johnston@gmail.com, rajkumar820999@gmail.com, pgsql-admin@lists.postgresql.org
Subject: Re: Conversion of a column from Integer format type to 'timestamp with time zone'
In-Reply-To: <3165931.1674763810@sss.pgh.pa.us>
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