php时间的操作，前一天，后一天时间的获取
<?php
date_default_timezone_set('PRC'); //默认时区
echo "今天:",date("Y-m-d",time()),"<br>";
echo "今天:",date("Y-m-d",strtotime("18 june 2008")),"<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>";
?>
距离某天的时间（php实现）
?
$date1 = strtotime('2011-04-30'); //把日期转换成时间戳
$date2 = time(); //取当前时间的时间戳
$nowtime=strftime("%y年-%m月-%d日 ",$date2); //格式化输出日期
$days=round(($date1-$date2)/3600/24); //四舍五入
echo "今天是<font color=\"red\">".$nowtime."</font>";
echo "<br/>距".strftime("%y年-%m月-%d日 ",$date1)."还有<font colr=\"red\">".$days."</font>天";
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