Get interval seconds between two datetime in PHP?

You can use strtotime() to do that:

$diff = strtotime('2009-10-05 18:11:08') - strtotime('2009-10-05 18:07:13')

A similar approach is possible with DateTime objects, e.g.

$date = new DateTime( '2009-10-05 18:07:13' );
$date2 = new DateTime( '2009-10-05 18:11:08' );

$diff = $date2->getTimestamp() - $date->getTimestamp();

With DateTime objects, you can do it like this:

$date = new DateTime( '2009-10-05 18:07:13' );
$date2 = new DateTime( '2009-10-05 18:11:08' );

$diffInSeconds = $date2->getTimestamp() - $date->getTimestamp();

PHP Date Time reference is helpful for things like this: PHP Date Time Functions

strtotime() is probably the best way.

$seconds = strtotime('2009-10-05 18:11:08') - strtotime('2009-10-05 18:07:13')