[RESOLVED] age function wrong

[jasondavis]

I have this code to show a users age on there profile, The problem is it shows the correct age for some users and the wrong age for others.

Example birthdate 1983-04-21 should show age 24 but instead returns age 23

  //calculate years of age (input string: YYYY-MM-DD)
  function birthday ($birthday){
    list($year,$month,$day) = explode("-",$birthday);
    $year_diff  = date("Y") - $year;
    $month_diff = date("m") - $month;
    $day_diff   = date("d") - $day;
    if ($day_diff < 0 || $month_diff < 0)
      $year_diff--;
    return $year_diff;
  }

[NogDog]

Heh,...that function seems to be getting around. See my reply in this thread as WebDeveloper.com. 🙂

[jasondavis]

I think I found a good solution now works better with leap years is what i read

  //calculate years of age (input string: YYYY-MM-DD)
function birthday($birthday){
                $birthday = is_string($birthday) ? strtotime($birthday) : $birthday;       

                $secondsSince = time() - $birthday;
                $secondsInAYear = 31556926;
                $yearsSince = floor($secondsSince / $secondsInAYear);
                return $yearsSince;
}