how to get ISO8601. 5:30 using. date time object in. php code example

Example: php convert date and time to iso 8601

//Object Oriented Method

$datetime = new DateTime('2010-12-30 23:21:46');

echo $datetime->format(DateTime::ATOM); // Updated ISO8601


//Procedural Method

echo date(DATE_ISO8601, strtotime('2010-12-30 23:21:46'));