The Basics

The simplist way to convert one date format into another is to use [strtotime()](<http://docs.php.net/manual/en/function.strtotime.php>) with [date()](<http://docs.php.net/manual/en/function.date.php>). strtotime() will convert the date into a Unix Timestamp. That Unix Timestamp can then be passed to date() to convert it to the new format.

$timestamp = strtotime('2008-07-01T22:35:17.02');
$new_date_format = date('Y-m-d H:i:s', $timestamp);

Or as a one-liner:

$new_date_format = date('Y-m-d H:i:s', strtotime('2008-07-01T22:35:17.02'));

Keep in mind that strtotime() requires the date to be in a valid format. Failure to provide a valid format will result in strtotime() returning false which will cause your date to be 1969-12-31.

Using DateTime()

As of PHP 5.2, PHP offered the [DateTime()](<http://docs.php.net/manual/en/class.datetime.php>) class which offers us more powerful tools for working with dates (and time). We can rewrite the above code using DateTime() as so:

$date = new DateTime('2008-07-01T22:35:17.02');
$new_date_format = $date->format('Y-m-d H:i:s');

Working with Unix timestamps

date() takes a Unix timestamp as its second parameter and returns a formatted date for you:

$new_date_format = date('Y-m-d H:i:s', '1234567890');

DateTime() works with Unix timestamps by adding an @ before the timestamp:

$date = new DateTime('@1234567890');
$new_date_format = $date->format('Y-m-d H:i:s');

If the timestamp you have is in milliseconds (it may end in 000 and/or the timestamp is thirteen characters long) you will need to convert it to seconds before you can can convert it to another format. There’s two ways to do this:

Trimming the last three digits can be acheived several ways, but using substr() is the easiest:

$timestamp = substr('1234567899000', -3);

You can also convert the timestamp into seconds by dividing by 1000. Because the timestamp is too large for 32 bit systems to do math on you will need to use the BCMath library to do the math as strings: