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date: attempt to more accurately describe year limitations with -v

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The previous description was both incorrect and incomplete in its
description -- the 2038 limit doesn't apply on !i386 platforms, and
it didn't note that values above 100 are accepted and interpreted
differently.  Further, it didn't note that absolute years are accepted.

Reviewed by:	pauamma_gundo.com (manpages)
Sponsored by:	Klara, Inc.
Differential Revision:	https://reviews.freebsd.org/D35360
This commit is contained in:
Kyle Evans 2022-06-27 22:54:13 -05:00
parent ad3ad06477
commit 9fcac31db4
1 changed files with 10 additions and 2 deletions
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12
bin/date/date.1
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@ -32,7 +32,7 @@
.\" @(#)date.1 8.3 (Berkeley) 4/28/95
.\" $FreeBSD$
.\"
.Dd November 3, 2021
.Dd May 31, 2022
.Dt DATE 1
.Os
.Sh NAME
@ -227,7 +227,15 @@ seconds are in the range 0-59, minutes are in the range 0-59, hours are
in the range 0-23, month days are in the range 1-31, week days are in the
range 0-6 (Sun-Sat),
months are in the range 1-12 (Jan-Dec)
and years are in the range 80-38 or 1980-2038.
and years are in a limited range depending on the platform.
.Pp
On i386, years are in the range 69-38 representing 1969-2038.
On every other platform, years 0-68 are accepted and represent 2000-2068, and
69-99 are accepted and represent 1969-1999.
In both cases, years between 100 and 1900 (both included) are accepted and
interpreted as relative to 1900 of the Gregorian calendar with a limit of 138 on
i386 and a much higher limit on every other platform.
Years starting at 1901 are also accepted, and are interpreted as absolute years.
.Pp
If
.Ar val