<?php  
echo "今天:".date("Y-m-d");       
echo "昨天:".date("Y-m-d",strtotime("-1 day"));       
echo "明天:".date("Y-m-d",strtotime("+1 day"));    
echo "一周后:".date("Y-m-d",strtotime("+1 week"));       
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"));       
echo "下个星期四:".date("Y-m-d",strtotime("next Thursday"));       
echo "上个周一:".date("Y-m-d",strtotime("last Monday"));       
echo "一个月前:".date("Y-m-d",strtotime("last month"));       
echo "一个月后:".date("Y-m-d",strtotime("+1 month"));       
echo "十年后:".date("Y-m-d",strtotime("+10 year"));      
?>