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    DateTime::setTimestamp

    date_timestamp_set

    (PHP 5 >= 5.3.0, PHP 7, PHP 8)

    DateTime::setTimestamp -- date_timestamp_set — 以 Unix 时间戳的方式设置日期和时间

    说明

    面向对象风格

    public DateTime::setTimestamp(int $timestamp): DateTime

    过程化风格

    date_timestamp_set(DateTime $object, int $timestamp): DateTime

    以 Unix 时间戳的方式设置日期和时间。

    跟 DateTimeImmutable::setTimestamp() 一样，但适用于 DateTime。

    过程化版本将 DateTime 对象作为第一个参数。

    参数

    object

    仅过程化风格：由 date_create() 返回的 DateTime 类型的对象。此函数会修改这个对象。

    timestamp

    代表日期的 Unix 时间戳。DateTimeImmutable::modify() 使用 @ 格式可以设置范围超过 int 的时间戳。

    返回值

    返回方法链修改后的 DateTime 对象。

    参见

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    User Contributed Notes 4 notes

    up
    12
    admin at torntech dot com
    9 years ago
    It should be noted above, be careful when manipulating the DateTime object with unix timestamps.
    In the above examples you will get varying results dependent on your current timezone, method used, and version of PHP.

    One would expect all of the examples above to perform the same as setTimestamp() or date('H:i', $timestamp); would.

    <?php
    date_default_timezone_set    ('America/New_York');

    $ts = 1171502725;
    ?>

    Set timestamp from UTC timezone use UTC timezone
    <?php
    $date     = new DateTime("@$ts");
    var_dump($date->format('Y-m-d H:i:s e'));
    /*
    string(26) "2007-02-15 01:25:25 +00:00" //PHP 5.3.0 - 5.6.8
    */
    ?>

    To convert the above to use the current timezone simply use
    <?php
    $date    ->setTimezone(date_default_timezone_get());
    //string(36) "2007-02-14 20:25:25 America/New_York"
    ?>

    Set the timestamp from UTC timezone use current timezone
    <?php
    $date     = new DateTime;
    $date->modify('@' . $ts);
    var_dump($date->format('Y-m-d H:i:s e'));
    /*
    string(36) "2007-02-15 01:25:25 America/New_York" //PHP 5.3.6 - 5.6.8
    string(36) "2052-06-20 18:53:24 America/New_York" //PHP 5.3.0 - 5.3.5
    */
    ?>

    Set the timestamp from current timezone use current timezone
    <?php
    $date     = new DateTime;
    $date->setTimestamp($ts);
    var_dump($date->format('Y-m-d H:i:s e'));
    /*
    string(36) "2007-02-14 20:25:25 America/New_York" //PHP 5.3.0 - 5.6.8
    */
    ?>
    up
    0
    Arnb
    11 years ago
    When you need to manipulate a unix timestamp like field (seconds since 1970-01-01) that may be greater than the drop dead date of 2038-01-19.

    <?php

    function secs2date($secs,$date)
        {
        if (    $secs>2147472000)    //2038-01-19 expire dt
                {
                $date->setTimestamp(2147472000);
                $s=$secs-2147472000;
                $date->add(new DateInterval('PT'.$s.'S'));
            }
        else
                $date->setTimestamp($secs);
        }

    function     date2secs($date,$datebeg)
        {
            $diff = $datebeg->diff($date);
            $secs=$diff->format('%a') * (60*60*24);  //total days
            $secs+=$diff->format('%h') * (60*60);     //hours
            $secs+=$diff->format('%i') * 60;              //minutes
            $secs+=$diff->format('%s');                     //seconds
            return $secs;
        }

    $datebeg = new DateTime('1970-01-01');
    $date=new dateTime();

    $secs=2017472000;  //2033-12-06 08:53:20
    secs2date($secs,$date);
    $dt=$date->format('Y-m-d H:i:s');
    echo     $dt."<br>";
    $sec2=date2secs($date,$datebeg);
    echo     '(1) ',$sec2,'***',$secs,'<br>';

    $secs=2397472000; //2045-12-21 12:26:40
    secs2date($secs,$date);
    $dt=$date->format('Y-m-d H:i:s');
    echo     $dt."<br>";
    $sec2=date2secs($date,$datebeg);
    echo     '(2) ',$sec2,'***',$secs,'<br>';
    ?>
    up
    -1
    Use Web Form at Aouie.net
    14 years ago
    When the exact time is important then it is important to note the difference between this and the UnixTimeStamp. The function will change the timestamp if necessary to take into account the daylight savings time.
    e.g. Working with the 'Europe/London' timezone and setting the DateTime object to a timestamp of 1288486753 will result in the function automatically altering it to 1288490353.
    This is because it is taking the fall time instead of the summer time (they will both be Sun, 31-Oct-2010 01:X:Y (I didn't check the hour and minute)).
    Sincerely,
    Aouie
    up
    -12
    linblow at hotmail dot fr
    13 years ago
    If your PHP version is lower than 5.3 then you can use this class to be able to use the functions "setTimestamp" and "getTimestamp":

    <?php

    class MyDateTime extends DateTime
    {
        public function     setTimestamp( $timestamp )
        {
                $date = getdate( ( int ) $timestamp );
                $this->setDate( $date['year'] , $date['mon'] , $date['mday'] );
                $this->setTime( $date['hours'] , $date['minutes'] , $date['seconds'] );
        }
       
        public function     getTimestamp()
        {
            return     $this->format( 'U' );
        }
    }

    $date = new MyDateTime();
    $date->setTimestamp( $someTimestamp );

    echo     $date->format( 'd/m/Y H:i:s' );

    ?>
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