[SOLVED] Date subtraction

[oceans]

Dear Friends,

 

Does any one know how to find the number of day between say 2007/07/08 and 2007/09/13

 

for date addition I use

 

$ForwardedDate= mktime(0,0,0,date("m"),date("d")+$DaysToForward,date("Y"));

 

Thanks.