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Top Forums Shell Programming and Scripting how to calculate the time 10 mins ago?? unix Post 302472421 by mithunpatel on Wednesday 17th of November 2010 06:45:14 AM
Old 11-17-2010
How to calculate unix epoch time with DC(Caulator)
--------------------------------------------------------------------------------
Hi All,
I have a similar problem:
In our code we are using below code to calculate the UNIX Epoch Time from the time stamp present in the file.
Can any one explain how the DC operates in below command and how we calculate the UNIX EPOCH time from this.
Date incide the file is 20:26:51
Output we get is 1289943554

File content:
0|0|4|472|2010-11-15 23:22:14|2010-11-15 23:30:06
0|0|3|200|2010-11-15 20:26:51|2010-11-15 20:30:11
Can you please explain.
 

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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 v5.16.2 2003-05-21 Epoch(3)
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