PHP时间比较和时间差如何计算

1.<?php

2. $zero1=date(“y-m-d h:i:s”);

3. $zero2=”2010-11-29 21:07:00′;

4. echo “zero1的时间为：”.$zero1.”<br>”;

5. echo “zero2的时间为：”.$zero2.”<br>”;

6. if(strtotime($zero1)<strtotime($zero2)){

7.  echo “zero1早于zero2′;

8. }else{

9.  echo “zero2早于zero1′;

10. }

11. ?>

上面是比较两个绝对时间的大小

<?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>";

?>

<?php
/**
* 时间差计算
*
* @param Timestamp $time
* @return String Time Elapsed
* @author Shelley Shyan
* @copyright http://phparch.cn (Professional PHP Architecture)
*/
function time2Units ($time)
{
   $year   = floor($time / 60 / 60 / 24 / );
   $time  -= $year * 60 * 60 * 24 * ;
   $month  = floor($time / 60 / 60 / 24 / );
   $time  -= $month * 60 * 60 * 24 * ;
   $week   = floor($time / 60 / 60 / 24 / );
   $time  -= $week * 60 * 60 * 24 * ;
   $day    = floor($time / 60 / 60 / );
   $time  -= $day * 60 * 60 * ;
   $hour   = floor($time / 60 / );
   $time  -= $hour * 60 * ;
   $minute = floor($time / );
   $time  -= $minute * ;
   $second = $time;
   $elapse = '';

$unitArr = array('年'  =>'year', '个月'=>'month',  '周'=>'week', '天'=>'day',
                    '小时'=>'hour', '分钟'=>'minute', '秒'=>'second'
                    );

foreach ( $unitArr as $cn => $u )
   {
       if ( $$u > 0 )
       {
           $elapse = $$u . $cn;
           break;
       }
   }

return $elapse;
}

$past = ; // Some timestamp in the past
$now = time(); // Current timestamp
$diff = $now - $past;

echo '发表于' . time2Units($diff) . '前';
?>

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PHP时间比较和时间差如何计算

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