How to get millisecond between two dateTime obj?

Question

How to get millisecond between two DateTime objects?

$date = new DateTime();
$date2 = new DateTime(\"1990-08-07 08:44\");

I t

Answer 1

Sorry to digg out an old question, but I've found a way to get the milliseconds timestamp out of a DateTime object:

function dateTimeToMilliseconds(\DateTime $dateTime)
{
    $secs = $dateTime->getTimestamp(); // Gets the seconds
    $millisecs = $secs*1000; // Converted to milliseconds
    $millisecs += $dateTime->format("u")/1000; // Microseconds converted to seconds
    return $millisecs;
}

It requires however that your DateTime object contains the microseconds (u in the format):

$date_str = "20:46:00.588";

$date = DateTime::createFromFormat("H:i:s.u", $date_str);

This is working only since PHP 5.2 hence the microseconds support to DateTime has been added then.

With this function, your code would become the following :

$date_str = "1990-08-07 20:46:00.588";
$date1 = DateTime::createFromFormat("Y-m-d H:i:s.u", $date_str);

$msNow = (int)microtime(true)*1000;

echo $msNow - dateTimeToMilliseconds($date1);