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Top Forums Shell Programming and Scripting how to find the time before 30 minutes Post 302346079 by BubbaJoe on Friday 21st of August 2009 02:30:10 AM
Old 08-21-2009
If you are using bash you can try using the --date option. Sonething like this
Code:
sh-3.2$ date
Fri Aug 21 01:16:57 CDT 2009
sh-3.2$ date --date="Fri Aug 21 01:16:57 -4:30"
Fri Aug 21 00:46:57 CDT 2009
sh-3.2$

 

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CONVDATE(1)						      General Commands Manual						       CONVDATE(1)

NAME
convdate - convert time/date strings and numbers SYNOPSIS
convdate [ -c ] [ -n ] [ -s ] arg... DESCRIPTION
Convdate translate the date/time strings specified as arguments on its command line, outputing the results one to a line. OPTIONS
-c If the ``-c'' flag is used, then each argument is taken to be a time_t and is output in ctime format. -n If the ``-n'' flag is used, then each argument is taken as a date string to be parsed by parsedate(3) and is output as a time_t; see time(2). -s If the ``-s'' flag is used, then each argument is taken as a date string to be parsed by parsedate(3) and is output as a string for- matted by ctime(3). This is the default. EXAMPLES
% convdate 'feb 10 10am' Sun Feb 10 10:00:00 1991 % convdate 12pm 5/4/90 Fri Dec 13 00:00:00 1991 Fri May 4 00:00:00 1990 % convdate -n 'feb 10 10am' '12pm 5/4/90' 666198000 641880000 % convdate -c 666198000 Sun Feb 10 10:00:00 1991 HISTORY
Written by Rich $alz <rsalz@uunet.uu.net>. This is revision 1.5, dated 1996/10/29. SEE ALSO
parsedate(3). CONVDATE(1)
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