Florian Lohoff wrote: > usage of relative dates seems to be "strange". "Last Month" should > definitly return a date in LAST month not just substract 28 days like > "4 weeks ago" > > [EMAIL PROTECTED]:~$ date --date "1 month ago" > Tue Mar 1 14:35:31 CET 2005 > [EMAIL PROTECTED]:~$ date --date "4 weeks ago" > Tue Mar 1 14:35:40 CET 2005 > [EMAIL PROTECTED]:~$ date --date "last month" > Tue Mar 1 14:35:49 CET 2005 > [EMAIL PROTECTED]:~$ date > Tue Mar 29 14:38:04 CEST 2005
The following text appears in the date manual.
The fuzz in units can cause problems with relative items. For
example, `2003-07-31 -1 month' might evaluate to 2003-07-01, because
2003-06-31 is an invalid date. To determine the previous month more
reliably, you can ask for the month before the 15th of the current
month. For example:
$ date -R
Thu, 31 Jul 2003 13:02:39 -0700
$ date --date="-1 month" +'Last month was %B?'
Last month was July?
$ date --date="$(date +%Y-%m-15) -1 month" +'Last month was
%B!'
Last month was June!
Also, take care when manipulating dates around clock changes such as
daylight saving leaps. In a few cases these have added or subtracted
as much as 24 hours from the clock, so it is often wise to adopt
universal time by setting the `TZ' environment variable to `UTC0'
before embarking on calendrical calculations.
Bob
--
Bob Proulx <[EMAIL PROTECTED]>
http://www.proulx.com/~bob/
CP-ASEL-IA-Tailwheel-Glider
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