How bash treats literal date value and retrieve year, month and date? Post: 302991551

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Top Forums UNIX for Beginners Questions & Answers How bash treats literal date value and retrieve year, month and date? Post 302991551 by drl on Monday 13th of February 2017 10:58:06 AM

02-13-2017

Registered User

Hi.

Depending on your OS, shell, etc. (which you forgot to post), and level of expertise, one or more of hte following may be of interest. I often use dateutils ... cheers, drl

Code:

Date, time arithmetic, math

        1) gnu date

        2) ksh ( version 93, not 88; ksh93 M 93t+ ) printf, e.g:
           printf "%(%Y-%m-%d)T\n" "yesterday"

        3) date.pl (limited arithmetic, but "date.pl -d '- 1 day'" works)
           ( https://www.unix.com/tips-tutorials/
           239167-general-purpose-date-script.html)

        4) dconv et al, e.g. ddiff, dconv, strptime (parsing), etc.
           ( dateutils: http://www.fresse.org/dateutils/ )

        5) tm2tm (, OK in 32-bit; fails to compile in 64-bit)
           ( https://www.unix.com/shell-programming-scripting/
           146216-date-difference-between-freebsd-linux.html#post302463136 )

        6) perl custom formatting (with function POSIX::strftime, "perldoc POSIX")

        7) date-cpan.pl, cpan perl date
           ( http://cpansearch.perl.org/src/CWEST/ppt-0.14/src/date/date.jgross )

        8) For small changes, say, "yesterday" in bash, ksh
           TZ=CST+24 date +%Y%m%d
           csh, tcsh
           setenv TZ CST+24 ; date +%Y%m%d

        9) Check for legal date:
           manstat:validata ( http://oldwww.acm.org/perlman/stat/ )

        10) Check for legal date:
            validate (local perl code)

        11) Shell, ksh, date calculations:
            www.unix.com/unix-for-dummies-questions-and-answers/4870-days-elapsed-between-2-dates.html

drl

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LEARN ABOUT DEBIAN

cgi::untaint::date

CGI::Untaint::date(3pm) 				User Contributed Perl Documentation				   CGI::Untaint::date(3pm)

NAME

       CGI::Untaint::date - validate a date

SYNOPSIS

	 use CGI::Untaint;
	 my $handler = CGI::Untaint->new($q->Vars);

	 my $date = $handler->extract(-as_date => 'date');

DESCRIPTION

       is_valid

       This Input Handler verifies that it is dealing with a reasonable date. Reasonably means anything that Date::Manip thinks is sensible, so
       you could use any of (for example):
	 "December 12, 2001"
	 "12th December, 2001"
	 "2001-12-12"
	 "next Tuesday"
	 "third Wednesday in March"

       See Date::Manip for much more information on what date formats are acceptable.

       The resulting date will be a Date::Simple object.  Date::Simple for more information on this.

       date_format

       By default ambiguous dates of the format 08/09/2001 will be treated as UK style (i.e. 8th September rather than 9th August)

       If you want to change this, subclass it and override date_format()

WARNING

       Date::Manip does not play nicely with taint mode. In order to work around this we locally clobber Date::Manip's 'timezone' code. As we're
       only interested in dates rather than times, this shouldn't be much of an issue. If it is, then please let me know!

SEE ALSO

       Date::Simple. Date::Manip.

AUTHOR

       Tony Bowden

BUGS and QUERIES
       Please direct all correspondence regarding this module to:
	 bug-CGI-Untaint-date@rt.cpan.org

COPYRIGHT and LICENSE
       Copyright (C) 2001-2005 Tony Bowden. All rights reserved.

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.10.0							    2008-05-12						   CGI::Untaint::date(3pm)