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Top Forums Shell Programming and Scripting how to get what date was 28 days ago of the current system date IN UNIX Post 302405218 by panyam on Thursday 18th of March 2010 07:13:25 AM
Old 03-18-2010
Hi thillai_selvan,

I suspect the command you have given might be OS dependent (the format you suggested available under GNU and it's part of sh-utils package) as it does not work in my case too.

Code:
 
avalon:/disk1/jvsh/TEST/TES>date
Thu Mar 18 16:39:47 IST 2010
avalon:/disk1/jvsh/TEST/TES>date +%Y-%m-%d --date='28 day ago'
2010-03-18

Reddy,

have a look here : https://www.unix.com/shell-programmin...ipulation.html

and something also like this you can use :

Code:
perl -le 'print scalar localtime (time() - 86400 * 28);'


Last edited by panyam; 03-18-2010 at 08:18 AM..
 

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DATE(1) 						      General Commands Manual							   DATE(1)

NAME
date - print or set the date and time SYNOPSIS
date [-qsu] [[MMDDYY]hhmm[ss]] [+format] OPTIONS
-q Read the date from stdin -s Set the time (implicit for -q or a date string) -u Print the date as GMT -t Use this number of seconds instead of current time EXAMPLES
date # Print the date and time date 0221921610 # Set date to Feb 21, 1992 at 4:10 p.m. DESCRIPTION
With the -q flag or a numeric argument, date sets the GMT time and date. MMDDYY refers to the month, day, and year; hhmmss refers to the hour, minute and second. Each of the six fields must be exactly two digits, no more and no less. date always display the date and time, with the default format for the system. The -u flag request GMT time instead of local time. A format may be specified with a + followed by a printf-like string with the following options: %% % character %A Name of the day %B Name of the month %D mm/dd/yy %H Decimal hour on 2 digits %I Decimal hour modulo 12 on 2 digits %M Decimal minute on 2 digits %S Decimal seconds on 2 digits %T HH:MM:SS %U Decimal week number, Sunday being first day of week %W Decimal week number, Monday being first day of week %X Same as %T %Y Decimal year on 4 digits %Z Time Zone (if any) %a Abbreviated name of the day %b Abbreviated name of the month %c Appropriate date & time (default format) %d Decimal day of the month on 2 digits %e Same as %d, but a space replaces leading 0 %h Same as %b %j Decimal dey of the year on 3 digits %m Decimal month on 2 digits %n Newline character %p AM or PM %r 12-hour clock time with AM/PM %s Number of seconds since the epoch %t Tab character %w Decimal day of the week (0=Sunday) %x Same as %D %y Decimal year on 2 digits SEE ALSO
time(2), ctime(3), readclock(8). DATE(1)
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