php strtotime 转换错误的日期答案

【问题标题】：php strtotime convert wrong datephp strtotime 转换错误的日期
【发布时间】：2011-05-29 19:51:10
【问题描述】：

我想知道为什么以秒为单位将日期转换为时间，然后再转换回来，结果是错误的？？？

$br= "<br>";

$unixtime= 1277267278;
echo 'unix time: ' . $unixtime . $br;

$readabledate= date('Y-m-d H:i:s', $unixtime);
echo 'readable date: ' . $readabledate . $br;

$expirydate= date('Y-m-d H:i:s', strtotime($readabledate . " +6 months + 7 days"));
echo 'expirydate: ' . $expirydate . $br;

$epochtime= convertFromDateToEpochTime($expirydate);   //convert to unixtime

echo 'epochtime: '. $epochtime . $br;

$readexpirydate= convertFromEpochTimeToDate($epochtime,$method = 1);  //convert it back to readable date

echo 'readexpirydate: '. $readexpirydate . $br;  // final result is wrong- 2009-11-03 xx

echo $br.$br.$br.$br.$br;
function convertFromDateToEpochTime($date)
{
        $year=substr($date,0,4);
        $month=substr($date,4,2);
        $day=substr($date,6,2);
        $hour=substr($date,8,2);
        $minute=substr($date,10,2);
        $second=substr($date,12,2);
        $newdate=mktime($hour,$minute,$second,$month,$day,$year);

        return $newdate;
}


function convertFromEpochTimeToDate($epoch,$method = 1)
{
 if ($method == 1)
    $date= date("Y-m-d H:i:s", $epoch);

 else if ($method == 2)
  $date= date("m/d/y H:i:s", $epoch);

 return $date;
}

【问题讨论】：

标签： date strtotime epoch

【解决方案1】：

你需要这个

$unixtime= 1277267278;
echo 'unix time: ' . $unixtime . $br;

$readabledate= date('Y-m-d H:i:s', $unixtime);
echo 'readable date: ' . $readabledate . $br;

$expirydate= date('Y-m-d H:i:s', strtotime($readabledate . " +6 months + 7 days"));
echo 'expirydate: ' . $expirydate . $br;

$epochtime= strtotime($expirydate);   //convert to unixtime

echo 'epochtime: '. $epochtime . $br;

$readexpirydate= date('Y-m-d H:i:s', $epochtime);  //convert it back to readable date

echo 'readexpirydate: '. $readexpirydate . $br;

结果是： Unix时间：1277267278
可读日期：2010-06-23 09:57:58
有效期：2010-12-30 09:57:58
时代：1293683278
读取过期日期：2010-12-30 09:57:58

【讨论】：