[SOLVED] date validation problem

[proud]

I want to write a php code to validate a date string which has to be in the format:mmyy, for example (0308).. where 03 is (march) and 08 is (2008). months can range from 01 - 12, for example 13 is not acceptable: 1309..

Also months from january till september has to start with a 0: 0109,0209,0309 etc...

 

finally i want to make sure that the provided string does not exceed the current year and month, for instance 0509 is accepted but 0609 or 0310 must be rejected.

 

I don't know which php function can be used for such a validation, any help would be appreciated.

[will35010]

Will this PEAR package work for you? It has date validation.

 

http://pear.php.net/package/Validate/docs/0.8.2/Validate/Validate.html

[Michdd]

Only having the 2 number-representation of the year won't allow you to check if the year is valid. Because say the year is 1993, it would be 93. But the 2 number for 2009 is 09, and 93 > 09. You need to know the full year. Besides that you can do something like this (to get you started):

 

function valid_date($date)
{
$now = str_split(date('my'), 2);
$date = str_split($date, 2);
if($date[0] > 12)  //If the month is over 12.
{
	return false;
}
return true;
}

$date = 0308;
if(valid_date($date)
{
echo 'The date is valid!';
}
else
{
echo 'Invalid Date!';
}

[Ken2k7]

There isn't a PHP function that handles your specific case. At least not one I know of. It wouldn't make sense to represent a date as such anyways.

 

<?php
function validDate ($date, $current_month, $current_year) {
     if (strlen($date) !== 4) return false;
     $month = substr($date, 0, 2);
     $year = substr($date, 2, 2);
     return intval($month) <= intval($current_month) && intval($year) <= intval($current_year);
}

$valid_date = '0509';
$invalid_date = '0609';
$invalid_date2 = '1309';
$invalid_date3 = '109';

$current_month = date('m');
$current_year = date('y');

echo $valid_date . 'is ' . (validDate($valid_date, $current_month, $current_year)? 'valid' : 'invalid') . "\n";
echo $invalid_date . 'is ' . (validDate($invalid_date, $current_month, $current_year)? 'valid' : 'invalid') . "\n";
echo $invalid_date2 . 'is ' . (validDate($invalid_date2, $current_month, $current_year)? 'valid' : 'invalid') . "\n";
echo $invalid_date3 . 'is ' . (validDate($invalid_date3, $current_month, $current_year)? 'valid' : 'invalid') . "\n";