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before x days

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# 1  
Old 11-10-2010
before x days
hello,

I needed to put value of date - 20 days in certain variable like this:
Code:
before20d=`TZ=MET+480 date +%Y%m%d`

echo $before20d


value just perfect ...what I need and if I execute "date":

Wed Nov 10 11:58:43 MET 2010

on the other solaris platform if I execute this I get todays date..

if I execute "date":

Wed Nov 10 11:59:31 CET 2010


How to figure 20 days before on second platform...

thank you guys..
Last edited by vbe; 11-10-2010 at 09:00 AM.. Reason: cote tags
# 2  
Old 11-10-2010
Code:
perl -e '($wday,$mon,$mday,$time,$year)=split(/\s+/,scalar gmtime(time - (20 * 86400)));print"$wday $mon $mday $time GMT $year\n";'

(20 * 86400) is your 20 days
you can use (20 * 24 * 3600) for hours per day

also you can use simple: perl -e 'print scalar gmtime(time - 20 * 86400),"\n";'
but there will be no GMT then
Last edited by vbe; 11-10-2010 at 09:01 AM.. Reason: code tags please
tip78
# 3  
Old 11-10-2010
if you search the site you will find a number of similar queries.

Also there is an outstanding FAQ entry: https://www.unix.com/answers-frequent...rithmetic.html

You should find what you're looking for and more in there.

HTH
# 4  
Old 11-10-2010
hmm..nice one..I modified it like this:

Code:
perl -e '($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst)=localtime(time - (20 * 86400));printf "%4d-%02d-%02d %02d:%02d:%02d\n",$year+1900,$mon+1,$mday,$hour,$min,$sec;'

perl is ok too..

thanks guys
Last edited by vbe; 11-10-2010 at 09:02 AM.. Reason: code tags please
# 5  
Old 11-10-2010
Code:
xdays=20;echo "beforexdays -> $(perl -e 'use POSIX;print strftime "%Y-%m-%d\n",localtime time-24*60*60*'$xdays'')"

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