Subtracting dates in PHP [duplicate]

This question already has answers here: 开发者_如何学Go Closed 10 years ago.

Possible Duplicate:

How to calculate the difference between two dates using PHP?

I have timestamps stored in the format YYYY-MM-DD HH:MM:SS (for example 2010-06-21 20:12:56). What would the best way to check how old the timestamp is? For the moment I am mainly interested in the number of days old.

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You can use strtotime to convert the string to a UNIX timestamp, which is in seconds. time() will give you the current UNIX timestamp. Subtract them to get how old the date is in seconds, and divide by 60*60*24 to get it in days

It's also doable using DateTime::diff, although I find the date functions easier than using the classes

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$today = strtotime(date('Y-m-d H:i:s'));
$expireDay = strtotime($row['ExpireDate']);
$timeToEnd = $expireDay - $today;