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Top Forums Shell Programming and Scripting Compare two dates using Shell Programming Post 302142497 by grulos on Friday 26th of October 2007 02:46:18 PM
Old 10-26-2007
in bash you could do
(( ${a:0:4} <= ${b:0:4} )) && echo true || echo false
or if you want to check year AND day
(( ${a:0:4} <= ${b:0:4} && ${a:5:2} <= ${b:5:2} )) && echo true|| echo false
 

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Data::FormValidator::Constraints::Dates(3pm)		User Contributed Perl Documentation	      Data::FormValidator::Constraints::Dates(3pm)

NAME
Data::FormValidator::Constraints::Dates - Validate Dates and Times SYNOPSIS
use Data::FormValidator::Constraints::Dates qw(date_and_time); # In a DFV profile... constraint_methods => { # 'pp' denotes AM|PM for 12 hour representation my_time_field => date_and_time('MM/DD/YYYY hh:mm:ss pp'), } DESCRIPTION
date_and_time Note: This is a new module is a new addition to Data::FormValidator and is should be considered "Beta". This constraint creates a regular expression based on the format string passed in to validate your date against. It understands the following symbols: Y year (numeric) M month (numeric) D day (numeric) h hour m minute s second p AM|PM Other parts of the string become part of the regular expression, so you can do perlish things like this to create more complex expressions: 'MM?/DD?/YYYY|YYYY-MM?-DD?' Internally Date::Calc is used to test the functions. BACKWARDS COMPATIBILITY
This older, more awkward interface is supported: # In a Data::FormValidator Profile: validator_packages => [qw(Data::FormValidator::Constraints::Dates)], constraints => { date_and_time_field => { constraint_method => 'date_and_time', params=>['MM/DD/YYYY hh:mm:ss pp'], # 'pp' denotes AM|PM for 12 hour representation }, } SEE ALSO
o Data::FormValidator o Data::FormValidator::Constraints::DateTime - This alternative features returning dates as DateTime objects and validating against the date formats required for the MySQL and PostgreSQL databases. AUTHOR
Mark Stosberg, <mark@summersault.com> Featuring clever code by Jan Krynicky. COPYRIGHT AND LICENSE
Copyright 2003-2005 by Mark Stosberg This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.14.2 2011-11-25 Data::FormValidator::Constraints::Dates(3pm)
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