PHP Calculate Age

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This is the simplest way I could devise to calculate a person’s age. Basically I calculate the input variable and use strtotime() to convert it to a timestamp. I chose this method to give the most flexibility in the input. Then I simply calculate the difference in seconds and divide that by the number of seconds in a year. You should probably add some validation to be sure the input date is before today, but again, this is quick and dirty.

 
date_default_timezone_set('America/Los_Angeles');
 
function calculateAge($birthday){
 
	return floor((time() - strtotime($birthday))/31556926);
 
}
 
//USAGE EXAMPLES
 
echo calculateAge('1978-07-11');
 
echo calculateAge('7/11/1978');
 
echo calculateAge('7/11/78');
 
echo calculateAge('July 11, 1978');

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Published:
11.6.07 / 5pm
Category:
PHP
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