Doc: fix discussion of how to get real Julian Dates.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 56e234b6aff9c2e3b97fe647156012b5b175680f
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2021-04-28T14:03:28Z
Releases: 10.17
Doc: fix discussion of how to get real Julian Dates.

Somehow I'd convinced myself that rotating to UTC-12 was the way
to do this, but upon further review, it's definitely UTC+12.

Discussion: https://postgr.es/m/1197050.1619123213@sss.pgh.pa.us

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doc/src/sgml/datetime.sgml modified +7 −7

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