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

2021年4月28日 14:03:28 +0000 (10:03 -0400)

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

doc/src/sgml/datetime.sgml patch | blob | blame | history

diff --git a/doc/src/sgml/datetime.sgml b/doc/src/sgml/datetime.sgml

index 2e48d5d788580a9266c84350e5a73e18f6e3ebc3..c53bd2f379f4f50487a2bfdc397d66f4f93276a3 100644 (file)

--- a/doc/src/sgml/datetime.sgml

+++ b/doc/src/sgml/datetime.sgml

@@ -908,22 +908,22 @@ $ <userinput>cal 9 1752</userinput>

<para>

This definition does, however, provide a way to obtain the astronomical

definition when you need it: do the arithmetic in time

- zone <literal>UTC-12</literal>. For example,

+ zone <literal>UTC+12</literal>. For example,

-=> SELECT extract(julian from '2021年06月23日 7:00:00-04'::timestamptz at time zone 'UTC-12');

+=> SELECT extract(julian from '2021年06月23日 7:00:00-04'::timestamptz at time zone 'UTC+12');

extract

------------------------------

- 2459389.95833333333333333333

+ 2459388.95833333333333333333

(1 row)

-=> SELECT extract(julian from '2021年06月23日 8:00:00-04'::timestamptz at time zone 'UTC-12');

+=> SELECT extract(julian from '2021年06月23日 8:00:00-04'::timestamptz at time zone 'UTC+12');

extract

--------------------------------------

- 2459390.0000000000000000000000000000

+ 2459389.0000000000000000000000000000

(1 row)

-=> SELECT extract(julian from date '2021年06月2日4');

+=> SELECT extract(julian from date '2021年06月2日3');

extract

---------

- 2459390

+ 2459389

(1 row)

</programlisting>

</para>

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