date calculation

[dmotah]

hi thanks for the help about php5 tutorials. now i got a problem!
lets say i want to make calculation on date how do i do that?
e.g i want to calculate the age using and entered format of d of birth eg 20/12/1982
plz help

[NogDog]

<?php
function getAge($yr, $mo, $day)
{
   if(!checkdate($mo, $day, $yr))
   {
      user_error("getAge(): Invalid birth date.");
      return(FALSE);
   }
   list($yrNow, $moNow, $dayNow) = explode('-', date('Y-m-d'));
   $age = $yrNow - $yr;
   if($mo > $moNow or ($mo == $moNow and $day > $dayNow))
   {
      $age--;
   }
   return($age);
}
// sample usage:
$birthday = '20/12/1982';   //  dd/mm/yyyy
// get parts of the date:
list($day, $month, $year) = explode('/', $birthday);
// get age:
echo getAge($year, $month, $day);