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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
Old 04-26-2012
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

These 4 Users Gave Thanks to itkamaraj For This Post:
 

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CAL_FROM_JD(3)								 1							    CAL_FROM_JD(3)

cal_from_jd - Converts from Julian Day Count to a supported calendar

SYNOPSIS
array cal_from_jd (int $jd, int $calendar) DESCRIPTION
cal_from_jd(3) converts the Julian day given in $jd into a date of the specified $calendar. Supported $calendar values are CAL_GREGORIAN, CAL_JULIAN, CAL_JEWISH and CAL_FRENCH. PARAMETERS
o $jd - Julian day as integer o $calendar - Calendar to convert to RETURN VALUES
Returns an array containing calendar information like month, day, year, day of week, abbreviated and full names of weekday and month and the date in string form "month/day/year". EXAMPLES
Example #1 cal_from_jd(3) example <?php $today = unixtojd(mktime(0, 0, 0, 8, 16, 2003)); print_r(cal_from_jd($today, CAL_GREGORIAN)); ?> The above example will output: Array ( [date] => 8/16/2003 [month] => 8 [day] => 16 [year] => 2003 [dow] => 6 [abbrevdayname] => Sat [dayname] => Saturday [abbrevmonth] => Aug [monthname] => August ) SEE ALSO
cal_to_jd(3), jdtofrench(3), jdtogregorian(3), jdtojewish(3), jdtojulian(3), jdtounix(3). PHP Documentation Group CAL_FROM_JD(3)
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