Obtenga la diferencia de horas entre dos fechas en PHP
$hourdiff = round((strtotime($time1) - strtotime($time2))/3600, 1);
Ankur
$hourdiff = round((strtotime($time1) - strtotime($time2))/3600, 1); date_default_timezone_set("Africa/Johannesburg");
$now = new DateTime();
$future_date = new DateTime('2020-10-21 00:00:00');
$interval = $future_date->diff($now);
echo ($interval->format("%a") * 24) + $interval->format("%h"). " hours". $interval->format(" %i minutes ");
print_r($now->format('Y-m-d H:i:s'));