Calculating the difference between two dates

[MortimerJazz]

I'm trying to calculate the number of hours/days/weeks since a particular user has logged into the website.

Here's what I've got so far. The last_login variable comes from the database.

[code]
$current=gmdate('d-m-Y H:i');
$last_login=date("m/d/Y", strtotime($last_login));
$difference=$current-$last_login;
echo "Seller last login: $difference";
}
[/code]

Unfortunately, that doesn't seem to be working. All I'm getting is a big fat "0" being printed on the screen.

Can someone tell me where I'm going wrong?

[The Little Guy]

This might help you out: http://viplyrics.com/tzfiles/phpcode/age_calculator.php <- it calculates years, you may need to modify it though, it also starts with the example first