<?php
$zero1=date(“y-m-d h:i:s”);
$zero2=”2010-11-29 21:07:00′;
echo “zero1的时间为：”.$zero1.”<br>”;
echo “zero2的时间为：”.$zero2.”<br>”;
if(strtotime($zero1)<strtotime($zero2)){
echo “zero1早于zero2′;
}else{
echo “zero2早于zero1′;
}
?>
<?php
$zero1=strtotime (date("y-m-d h:i:s")); //当前时间 ,注意H 是24小时 h是12小时
$zero2=strtotime ("2014-1-21 00:00:00"); //过年时间，不能写2014-1-21 24:00:00 这样不对
$guonian=ceil(($zero2-$zero1)/86400); //60s*60min*24h
echo "离过年还有<strong>$guonian</strong>天！";
?>
上面是倒计时小程序 实例代码
<?php
//PHP计算两个时间差的方法
$startdate="2010-12-11 11:40:00";
$enddate="2012-12-12 11:45:09";
$date=floor((strtotime($enddate)-strtotime($startdate))/86400);
$hour=floor((strtotime($enddate)-strtotime($startdate))%86400/3600);
$minute=floor((strtotime($enddate)-strtotime($startdate))%86400/60);
$second=floor((strtotime($enddate)-strtotime($startdate))%86400%60);
echo $date."天<br>";
echo $hour."小时<br>";
echo $minute."分钟<br>";
echo $second."秒<br>";
?>
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