Sivamanim

<?php 
// Current date
echo date('Y-m-d');

// Current time
echo date('H:i a');
// Date replated questions refer following link
?>http://php.net/manual/en/function.date.php

Sivamanim

<?php 
		
		 $db_time = '2017-09-21 12:00:00 PM';
		 $db_timezone = 'Asia/Kolkata';
		 $user_timezone = 'America/New_York';
		 
		 date_default_timezone_set($db_timezone);  //Change default timezone to old timezone within this function only.
			$originalTime = new DateTime($db_time);
			$originalTime->setTimeZone(new DateTimeZone($user_timezone)); //Convert to desired TimeZone.
			date_default_timezone_set($user_timezone) ; //Reset default TimeZone according to your global settings.