From: Ron <ronljohnsonjr@gmail.com>
To: pgsql-admin@lists.postgresql.org
Subject: Re: Conversion from Number to Date
Date: Thu, 15 Jun 2023 22:07:17 -0500
Message-ID: <24386a21-7b10-deb1-6285-c7f0efa9d0f4@gmail.com> (raw)
In-Reply-To: <3C2586BD-E0DC-4BAB-B791-1A789BAFFB7E@elevated-dev.com>
References: <PH2P110MB0922CF0FC2F018080EF7A41DFF58A@PH2P110MB0922.NAMP110.PROD.OUTLOOK.COM>
<PH7PR19MB59686176B5B56B8FE3876939D358A@PH7PR19MB5968.namprd19.prod.outlook.com>
<3C2586BD-E0DC-4BAB-B791-1A789BAFFB7E@elevated-dev.com>
On 6/15/23 21:29, Scott Ribe wrote:
>> On Jun 15, 2023, at 8:23 PM, M Sarwar <sarwarmd02@outlook.com> wrote:
>>
>> During the data load from CSV files to the database, the above START_TIME and STOP_TIME date column data arrived as number value.
>> Now I need to translate the START_TIME and STOP_TIME back to DATE format.
> Add a number to a date, you get a date that many days out. Similarly, you can add an interval to a timestamp. So you'll need to know the base used for those numbers, and the unit of measurement.
>
> For instance, if the numbers for date are an offset from 1970-01-01 (Unix epoch):
>
> '1970-01-01'::date + <number>
That was my first thought, but there are only 19500 days since 1 jan 1970.
It turns out that 15 Oct 1900 was 44800 days before today, so 1 Jan 1900
might be the epoch.
> If the numbers for time are seconds from then:
>
> '1970-01-01'::timestamptz + '<number> seconds'::interval
>
> Of course you'll also need to know what time zone the times are in, I will graciously leave that as an exercise ;-)
>
> Also, the documentation page you needed:
>
> https://www.postgresql.org/docs/15/functions-datetime.html
>
>
>
--
Born in Arizona, moved to Babylonia.
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To: pgsql-admin@postgresql.org
Cc: ronljohnsonjr@gmail.com, pgsql-admin@lists.postgresql.org
Subject: Re: Conversion from Number to Date
In-Reply-To: <24386a21-7b10-deb1-6285-c7f0efa9d0f4@gmail.com>
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