What's wrong with a DateTime object

Question

Can someone say what is wrong with the code.

$timezone = "Asia/Karachi"; 
$date = new DateTime($when_to_send, new DateTimeZone($timezone));
$date = $date->setTimezone(new DateTimeZone('GMT')); 
$when_to_send = $date->format('Y-m-d H:i:s');

Error: call to function member function () for non-object

Answer 1

$date = $date->setTimezone(new DateTimeZone('GMT'));

Sets the $ date null variable, you should just call it:

$date->setTimezone(new DateTimeZone('GMT'));

Answer 2

If you are not using at least PHP 5.3.0 (as written in the manual that you probably read before the request, right?), It setTimezonewill return NULL instead of the modified DateTime. Do you use at least PHP 5.3.0?

Answer 3

manual, setTimeZone DateTime, FALSE, " t . , DateTime, .

Perhaps you should check to see if setTimeZoneyour $datereturn value was set before setting your object :

$timezone = "Asia/Karachi";
$date = new DateTime($when_to_send, new DateTimeZone($timezone));

if (! ($date && $date->setTimezone(new DateTimeZone('GMT'))) ) {
    # unable to adjust from local timezone to GMT!
    # (display a warning)
}

$when_to_send = $date->format('Y-m-d H:i:s');

Answer 4

Thanks to everyone who helped, but only the correct answer can be noted. Correct code

$timezone = "Asia/Karachi"; 
$date = new DateTime($when_to_send, new DateTimeZone($timezone));
$date->setTimezone(new DateTimeZone('GMT')); 
$when_to_send = $date->format('Y-m-d H:i:s');