age calculator

[webnick]

Can anyone tell me what I'm missing in my math for this? Pre 1970 dates are coming up 37 years short! Thanks,

function getAge($date) 
{
	$t = mktime(); // 1970s unix bday
	$a = explode('/', $date);
	$d = mktime(0, 0, 0, $a[0], $a[1], $a[2]);
	if($d < 0){ $d = $d * -1 + $t; } // get total seconds from now
	$age = abs($t - $d);
	// return years,months,days,seconds array
	return array(
			$age / (60 * 60 * 24 * 365),
			$age / ((60 * 60 * 24 * 365) / 12),
			$age / ((60 * 60 * 24 * 365) / 365),
			$age
			);
}

print_r( getAge(date('m/d/Y')) );
print_r( getAge('1/01/1976') );
print_r( getAge('1/01/2026') );

[NogDog]

If you need to deal with pre-1970 (or post-2038) dates, you may want to look into using the PEAR Date package.

[webnick]

A date calculator:

function getAge($date, $futureDate=false)
{
		if(preg_match('/^[0-9]{1,2}\/[0-9]{1,2}\/([0-9]{2}|[0-9]{4})$/', $date) == false) { 
				return false; 
		}
		elseif($futureDate!==false && preg_match('/^[0-9]{1,2}\/[0-9]{1,2}\/([0-9]{2}|[0-9]{4})$/', $futureDate) == false) { 
				return false; 
		}

	list($m, $d, $y) = split('[/.-]', trim($date)); 
	$start = mktime(0, 0, 0, $m, $d, $y);
	$end = mktime(); // 1970s unix bday
	if($futureDate!==false) { 
			list($m, $d, $y) = split('[/.-]', trim($futureDate)); // delimiter can be slash, dot, or hyphen
			$end = mktime(0, 0, 0, $m, $d, $y);
	}
	$age = abs($end - $start);

	$y = $age / (365 * 24 * 60 * 60);
	$m = strstr($y, '.') * 12; // not month but number months
	$h = $age / (365 * 24); // hours in period
	return array(
			'y' => floor($y),
			'm' => floor($m),
			'h' => floor($h),
			's' => $age
			);
}

[suntra]

Why bother with timestamps when you can use a much easier way, with YYYY-MM-DD date format...

$strBirth = '1980-01-01';
$intYear = intval(substr($strBirth, 0, 4));
$strMonth_Day = substr($strBirth, 5);
$intAge = (intval(date('Y')) - $intYear) - ((date('m-d') < $strMonth_Day) ? 1 : 0);