<?php// Prints: October 3, 1975 was on a Fridayecho "Oct 3, 1975 was on a ".date("l", mktime(0,0,0,10,3,1975)) . "<br><br>";//The mktime() function is useful for doing date arithmetic and validation.//It will automatically calculate the correct value for out-of-range input:echo date("M-d-Y",mktime(0,0,0,12,36,2001)) . "<br>";echo date("M-d-Y",mktime(0,0,0,14,1,2001)) . "<br>";echo date("M-d-Y",mktime(0,0,0,1,1,2001)) . "<br>";echo date("M-d-Y",mktime(0,0,0,1,1,99)) . "<br>";?>