$t1= mktime(0, 0, 0, 9, 30, 2006) ; $t2= mktime(0, 0, 0, 10,1, 2006); $t3= mktime(0, 0, 0, 10,2, 2006); echo $t3-$t2 . ""; echo $t2-$t1 . ""; ?> output: 90000 86400