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Full Discussion: Time subtraction using perl
Top Forums Shell Programming and Scripting Time subtraction using perl Post 302415037 by tomjones on Wednesday 21st of April 2010 02:43:14 PM
Old 04-21-2010
D=`perl -le "print scalar localtime (time() - "50"*60);"`
echo $D

D1=`perl -le "@x=localtime (time() - "50"*60); printf(\"%4d%02d%02d%02d%02d%02d\n\", \$x[5]+1900,\$x[4]+1,\$x[3],\$x[2],\$x[1],\$x[0])"`
echo $D1


and output
Wed Apr 21 17:54:25 2010
107382063610738185091074160772107416091610741609521074160988



$D is ok
except $D1
 

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Time::Piece::MySQL(3pm) 				User Contributed Perl Documentation				   Time::Piece::MySQL(3pm)

NAME
Time::Piece::MySQL - Adds MySQL-specific methods to Time::Piece SYNOPSIS
use Time::Piece::MySQL; my $time = localtime; print $time->mysql_datetime; print $time->mysql_date; print $time->mysql_time; my $time = Time::Piece->from_mysql_datetime( $mysql_datetime ); my $time = Time::Piece->from_mysql_date( $mysql_date ); my $time = Time::Piece->from_mysql_timestamp( $mysql_timestamp ); DESCRIPTION
Using this module instead of, or in addition to, "Time::Piece" adds a few MySQL-specific date-time methods to "Time::Piece" objects. OBJECT METHODS
mysql_date / mysql_time / mysql_datetime / mysql_timestamp Returns the date and/or time in a format suitable for use by MySQL. CONSTRUCTORS
from_mysql_date / from_mysql_datetime / from_mysql_timestamp Given a date, datetime, or timestamp value as returned from MySQL, these constructors return a new Time::Piece object. If the value is NULL, they will retrun undef. CAVEAT "Time::Piece" itself only works with times in the Unix epoch, this module has the same limitation. However, MySQL itself handles date and datetime columns from '1000-01-01' to '9999-12-31'. Feeding in times outside of the Unix epoch to any of the constructors has unpredictable results. Also, MySQL doesn't validate dates (because your application should); it only checks that dates are in the right format. So, your database might include dates like 2004-00-00 or 2001-02-31. Passing invalid dates to any of the constructors is a bad idea: on my system the former type (with zeros) returns undef (previous version used to die) while the latter returns a date in the following month. AUTHOR
Original author: Dave Rolsky <autarch@urth.org> Current maintainer: Marty Pauley <marty+perl@kasei.com> COPYRIGHT
(c) 2002 Dave Rolsky (c) 2004 Marty Pauley This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. SEE ALSO
Time::Piece perl v5.12.4 2008-06-07 Time::Piece::MySQL(3pm)
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