Validating date in yyyymmdd format using PERL Post: 302630683

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Top Forums Shell Programming and Scripting Validating date in yyyymmdd format using PERL Post 302630683 by itkamaraj on Thursday 26th of April 2012 06:54:34 AM

04-26-2012

Registered User

Code:

 
$ cat one.pl
#!/bin/perl
use Time::Local;
my $date = $ARGV[0];
$date =~ s/\s+$//;
$date =~ s/^\s*//;
my ($year, $month, $day) = unpack "A4 A2 A2", $date;
eval{ 
    timelocal(0,0,0,$day, $month-1, $year); # dies in case of bad date
    print "$date is valid\n";
} or print "Bad date: $@";

Code:

bash-3.2$ perl one.pl 20120430
20120430 is valid

bash-3.2$ perl one.pl 20120431
Bad date: Day '31' out of range 1..30 at one.pl line 8

bash-3.2$ perl one.pl 20120231
Bad date: Day '31' out of range 1..29 at one.pl line 8

bash-3.2$ perl one.pl 20120229
20120229 is valid

bash-3.2$ perl one.pl 20120230
Bad date: Day '30' out of range 1..29 at one.pl line 8

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LEARN ABOUT PHP

cal_to_jd

CAL_TO_JD(3)								 1							      CAL_TO_JD(3)

cal_to_jd - Converts from a supported calendar to Julian Day Count

SYNOPSIS

       int cal_to_jd (int  $calendar, int  $month, int	$day, int  $year)

DESCRIPTION

       cal_to_jd(3)  calculates  the  Julian  day count for a date in the specified $calendar. Supported $calendars are CAL_GREGORIAN, CAL_JULIAN,
       CAL_JEWISH and CAL_FRENCH.

PARAMETERS

	      o $calendar
		- Calendar to convert from, one of CAL_GREGORIAN, CAL_JULIAN, CAL_JEWISH or CAL_FRENCH.

	      o $month
		- The month as a number, the valid range depends on the $calendar

	      o $day
		- The day as a number, the valid range depends on the $calendar

	      o $year
		- The year as a number, the valid range depends on the $calendar

RETURN VALUES

	A Julian Day number.

SEE ALSO

       cal_from_jd(3), frenchtojd(3), gregoriantojd(3), jewishtojd(3), juliantojd(3), unixtojd(3).

PHP Documentation Group 													      CAL_TO_JD(3)