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    DateTime::setTimestamp

    date_timestamp_set

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

    DateTime::setTimestamp -- date_timestamp_set — Unix タイムスタンプを用いて日付と時刻を設定する

    説明

    オブジェクト指向型

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

    手続き型

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

    Unix タイムスタンプを用いて日付と時刻を設定します。

    DateTimeImmutable::setTimestamp() に似ていますが、 DateTime を使って動作します。

    手続き型のバージョンは、 DateTime オブジェクトを最初の引数に取ります。

    パラメータ

    object

    手続き型のみ: date_create() が返す DateTime オブジェクト。 この関数は、このオブジェクトを変更します。

    timestamp

    日付を表す Unix タイムスタンプ。 DateTimeImmutable::modify() を @ フォーマットと共に使うと、 数値型の範囲外のタイムスタンプを設定できます。

    戻り値

    メソッドチェインに使う、変更された DateTime オブジェクトを返します。

    参考

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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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