<!DOCTYPE html>
<html>
<body>
<?php
// 输出：October 3, 1975 was on a Friday
echo "Oct 3, 1975 was on a ".date("l", mktime(0,0,0,10,3,1975)) . "<br><br>";
//在进行日期计算和验证时会用到 mktime() 函数
//它会对超出范围的输入值自动计算正确的值：
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>";
?>
</body>
</html>