php关于时间的获取,收藏备用

<?php
echo "今天:".date("Y-m-d")."<br>";     
echo "昨天:".date("Y-m-d",strtotime("-1 day")), "<br>";     
echo "明天:".date("Y-m-d",strtotime("+1 day")). "<br>";  
echo "一周后:".date("Y-m-d",strtotime("+1 week")). "<br>";     
echo "一周零两天四小时两秒后:".date("Y-m-d G:H:s",strtotime("+1 week 2 days 4 hours 2 seconds")). "<br>";     
echo "下个星期四:".date("Y-m-d",strtotime("next Thursday")). "<br>";     
echo "上个周一:".date("Y-m-d",strtotime("last Monday"))."<br>";     
echo "一个月前:".date("Y-m-d",strtotime("last month"))."<br>";     
echo "一个月后:".date("Y-m-d",strtotime("+1 month"))."<br>";     
echo "十年后:".date("Y-m-d",strtotime("+10 year"))."<br>";    
?>