PHP日期增加减少

<?PHP

$date1="2006-08-09";

echo date('Y-m-d',strtotime("$date1 +5 day")); //相应地,要增加月,年,将day改成month或year即可

?> 

输出结果：2006-08-14 

+++++++++++++    今天、昨天、明天 、上一周、下一周   +++++++++++++++ 

<?PHP 

date_default_timezone_set('PRC'); //默认时区 

echo "今天:",date("Y-m-d",time()),"<br>"; 

echo "昨天:",strtotime("-1 day")),"<br>"; 

echo "明天:",strtotime("+1 day")),"<br>"; 

echo "一周后:",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:",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>";

?>