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Full Discussion: comparing two dates.
Top Forums UNIX for Dummies Questions & Answers comparing two dates. Post 302332831 by Scott on Friday 10th of July 2009 07:14:53 AM
Old 07-10-2009
One option is to convert the date to a number (the UNIX epoch)...

Code:
#!/usr/bin/perl
use Time::Local;
print timelocal(0,0,0,@ARGV[1],@ARGV[0]-1,@ARGV[2])."\n";

Call this with three numbers: month day year

For example, if you put the above in a script called Epoch, then:

Code:
testdate=$(Epoch $(date '+%m %d %Y'))
ydate=$(Epoch $month $day1 $year
 
if [ $testdate -le $ydate ]; then
...
fi

 

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Epoch(3)						User Contributed Perl Documentation						  Epoch(3)

NAME
Time::Epoch - Convert between Perl epoch and other epochs SYNOPSIS
#!/usr/bin/perl -wl use Time::Epoch; my $perlsec = 966770660; # Sun Aug 20 07:24:21 2000 -0400 on Mac OS my $epochsec = perl2epoch($perlsec, 'macos', '-0400'); my $perlsec2 = epoch2perl($epochsec, 'macos', '-0400'); print $perlsec; print $perlsec2; print $epochsec; # correct time on Unix: print scalar localtime $perlsec; # correct time on Mac OS (-0400): print scalar localtime $epochsec; DESCRIPTION
Exports two functions, "perl2epoch" and "epoch2perl". Currently only goes between Perl (Unix) epoch and Mac OS epoch. This is in preparation for an eventual move of Perl to its own universal epoch, so we can get the system epoch of any platform that differs from Perl's. Epochs o macos Takes additional optional parameter of time zone differential. If time zone differential not supplied, we guess by getting the different between "localtime" and "gmtime" with <Time::Local::timelocal>. BUGS
o Hm. With the above test, "scalar localtime $perlsec" under my Linux box and "scalar localtime $epochsec" under my Mac OS box are off by one second from each other. Maybe a leap second thing? Odd. AUTHOR
Chris Nandor <pudge@pobox.com>, http://pudge.net/ Copyright (c) 2000-2003 Chris Nandor. All rights reserved. This program is free software; you can redistribute it and/or modify it under the terms of the Artistic License, distributed with Perl. SEE ALSO
perl(1), perlport(1), Time::Local. perl v5.18.2 2003-05-21 Epoch(3)
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