How to get millisecond between two dateTime obj? - php

Question

How to get millisecond between two DateTime objects?
$date = new DateTime();
$date2 = new DateTime("1990-08-07 08:44");
I tried to follow the comment below, but I got an error.
$stime = new DateTime($startTime->format("d-m-Y H:i:s"));
$etime = new DateTime($endTime->format("d-m-Y H:i:s"));
$millisec = $etime->getTimestamp() - $stime->getTimestamp();`
I get the error
Call to undefined method DateTime::getTimestamp()

Answer 1

In the strict sense, you can't.
It's because the smallest unit of time for the DateTime class is a second.
If you need a measurement containing milliseconds then use microtime()
Edit:
On the other hand if you simply want to get the interval in milliseconds between two ISO-8601 datetimes then one possible solution would be
function millisecsBetween($dateOne, $dateTwo, $abs = true) {
$func = $abs ? 'abs' : 'intval';
return $func(strtotime($dateOne) - strtotime($dateTwo)) * 1000;
}
Beware that by default the above function returns absolute difference. If you want to know whether the first date is earlier or not then set the third argument to false.
// Outputs 60000
echo millisecsBetween("2010-10-26 20:30", "2010-10-26 20:31");
// Outputs -60000 indicating that the first argument is an earlier date
echo millisecsBetween("2010-10-26 20:30", "2010-10-26 20:31", false);
On systems where the size of time datatype is 32 bits, such as Windows7 or earlier, millisecsBetween is only good for dates between 1970-01-01 00:00:00 and 2038-01-19 03:14:07 (see Year 2038 problem).

Answer 2

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);

Answer 3

DateTime supports microseconds since 5.2.2. This is mentioned in the documentation for the date function, but bears repeating here. You can create a DateTime with fractional seconds and retrieve that value using the 'u' format string.
<?php
// Instantiate a DateTime with microseconds.
$d = new DateTime('2011-01-01T15:03:01.012345Z');
// Output the microseconds.
echo $d->format('u'); // 012345
// Output the date with microseconds.
echo $d->format('Y-m-d\TH:i:s.u'); // 2011-01-01T15:03:01.012345
// Unix Format
echo "<br>d2: ". $d->format('U.u');
function get_data_unix_ms($data){
$d = new DateTime($data);
$new_data = $d->format('U.u');
return $new_data;
}
function get_date_diff_ms($date1, $date2)
{
$d1 = new DateTime($date1);
$new_d1 = $d1->format('U.u');
$d2 = new DateTime($date2);
$new_d2 = $d2->format('U.u');
$diff = abs($new_d1 - $new_d2);
return $diff;
}
https://www.php.net/manual/en/class.datetime.php

Answer 4

Here's a function to do that + tests.
https://gist.github.com/vudaltsov/0bb623b9e2817d6ce359eb88cfbf229d

Answer 5

DateTime dates are only stored as whole seconds. If you still need the number of milliseconds between two DateTime dates, then you can use getTimestamp() to get each time in seconds (then get the difference and turn it into milliseconds):
$seconds_diff = $date2.getTimestamp() - $date.getTimestamp()
$milliseconds_diff = $seconds_diff * 1000