date command help


 
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# 1  
Old 07-31-2008
date command help

Hi
Todays date command said "last month is this month !" Smilie

$ cat /etc/redhat-release
Red Hat Enterprise Linux ES release 4 (Nahant Update 3)

$ date
Thu Jul 31 14:21:21 JST 2008

$ date +%Y-%m
2008-07

$ date --date "last month" +%Y-%m
2008-07

$ date --date 'last month'
Tue Jul 1 14:21:34 JST 2008

why ?Smilie
# 2  
Old 07-31-2008
Quoting the date info page:

Quote:
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:

Code:
$ 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.
# 3  
Old 07-31-2008
Thanks era for your help.
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