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Explain that setting an absolute day value can fail and that the month should

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usually be set first when using -v.

Adjust an example that sets the day to 30 before setting the month to 3 in
accordance with this approach as the example would always fail in February!

PR:		147354
MFC after:	2 weeks
This commit is contained in:
Brian Somers 2010-06-04 06:56:58 +00:00
parent 17dca144a2
commit 5990bfb40b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=208795
1 changed files with 11 additions and 3 deletions
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14
bin/date/date.1
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@ -32,7 +32,7 @@
.\" @(#)date.1 8.3 (Berkeley) 4/28/95
.\" $FreeBSD$
.\"
.Dd June 2, 2007
.Dd June 3, 2010
.Dt DATE 1
.Os
.Sh NAME
@ -219,6 +219,14 @@ When the date is adjusted to a specific value that occurs twice
the resulting timezone will be set so that the date matches the earlier of
the two times.
.Pp
It is not possible to adjust a date to an invalid absolute day, so using
the switches
.Fl v No 31d Fl v No 12m
will simply fail five months of the year.
It is therefore usual to set the month before setting the day; using
.Fl v No 12m Fl v No 31d
always works.
.Pp
Adjusting the date by months is inherently ambiguous because
a month is a unit of variable length depending on the current date.
This kind of date adjustment is applied in the most intuitive way.
@ -339,9 +347,9 @@ will display the last day of February in the year 2000:
.Pp
.Dl "Tue Feb 29 03:18:00 GMT 2000"
.Pp
So will do the command:
So will the command:
.Pp
.Dl "date -v30d -v3m -v0y -v-1m"
.Dl "date -v3m -v30d -v0y -v-1m"
.Pp
because there is no such date as the 30th of February.
.Pp