How to add milliseconds to an Datetime object in php?

Question

If I have an object of type DateTime how I can add some milliseconds?

$date = new Datetime("2016-09-23T20:48:16.090Z");
// how to add to this date 9 milliseconds?

http://stackoverflow.com/questions/17909871/getting-date-format-m-d-y-his-u-from-milliseconds — LF00, Sep 24 '16 at 06:56
You can use DateInterval, but the smallest interval you can add seems to be a second. See http://php.net/manual/en/dateinterval.construct.php and http://php.net/manual/en/datetime.add.php — kkaosninja, Sep 24 '16 at 06:56
I want to calculate total loading time from a har file. For this I have a start date and the time in miliseconds for each request. — nicolae-stelian, Sep 24 '16 at 07:47

score 4 · Accepted Answer · answered Aug 29 '21 at 12:53

As of PHP 7.1, milliseconds and microseconds can also be easily added to DateTime using the modify method.

$date = new Datetime("2016-09-23T20:48:16.090Z");
$millisec = 9;

$date->modify('+ '.$millisec.' milliseconds');
var_dump($date);

Output:

object(DateTime)#1 (3) {
  ["date"]=>
  string(26) "2016-09-23 20:48:16.099000"
  ["timezone_type"]=>
  int(2)
  ["timezone"]=>
  string(1) "Z"
}

score 0 · Answer 2 · answered Dec 20 '22 at 17:36

For lower PHP versions like PHP 5.6 you could try:

    date_default_timezone_set('UTC');
    $micro_date = microtime();
    $date_array = explode(" ",$micro_date);
    $date = date("Y-m-d\TH:i:s",$date_array[1]);
    echo $date."." .round( $date_array[0] * 1000)."Z";

How to add milliseconds to an Datetime object in php?

2 Answers2