PHP

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'));

datetime iso 8601 php

(new DateTime('2022-05-01T16:00:00-03:00'))->format('Y-m-dTH:i:sp');

format datetime ISO php

$startTime 	= new DateTime($appointment_date . ' ' . $booking_slot[0]); // 2021-12-28 0900
$startTime	= $startTime->format('Y-m-dTH:i:sp'); // 2021-12-25T12:02:00Z