| From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
|---|---|
| To: | Andrew Dunstan <andrew(dot)dunstan(at)2ndquadrant(dot)com> |
| Cc: | David Steele <david(at)pgmasters(dot)net>, Robert Haas <robertmhaas(at)gmail(dot)com>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Suraj Kharage <suraj(dot)kharage(at)enterprisedb(dot)com>, tushar <tushar(dot)ahuja(at)enterprisedb(dot)com>, Rajkumar Raghuwanshi <rajkumar(dot)raghuwanshi(at)enterprisedb(dot)com>, Rushabh Lathia <rushabh(dot)lathia(at)gmail(dot)com>, Tels <nospam-pg-abuse(at)bloodgate(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>, Jeevan Chalke <jeevan(dot)chalke(at)enterprisedb(dot)com>, vignesh C <vignesh21(at)gmail(dot)com> |
| Subject: | Re: documenting the backup manifest file format |
| Date: | 2020-04-14 20:09:22 |
| Message-ID: | 20200414200922.GA20412@alvherre.pgsql |
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| Lists: | pgsql-hackers |
On 2020-Apr-14, Andrew Dunstan wrote:
> OK, but I think if we're putting a timestamp string in ISO-8601 format
> in the manifest it should be in UTC / Zulu time, precisely to avoid
> these issues. If that's too much trouble then yes an epoch time will
> probably do.
The timestamp is always specified and always UTC (except the code calls
it GMT).
+ /*
+ * Convert last modification time to a string and append it to the
+ * manifest. Since it's not clear what time zone to use and since time
+ * zone definitions can change, possibly causing confusion, use GMT
+ * always.
+ */
+ appendStringInfoString(&buf, "\"Last-Modified\": \"");
+ enlargeStringInfo(&buf, 128);
+ buf.len += pg_strftime(&buf.data[buf.len], 128, "%Y-%m-%d %H:%M:%S %Z",
+ pg_gmtime(&mtime));
+ appendStringInfoString(&buf, "\"");
I was merely saying that it's trivial to make this iso-8601 compliant as
buf.len += pg_strftime(&buf.data[buf.len], 128, "%Y-%m-%dT%H:%M:%SZ",
ie. omit the "GMT" string and replace it with a literal Z, and remove
the space and replace it with a T.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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