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PHP | date_default_timezone_set() Function

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The date_default_timezone_set() function is an inbuilt function in PHP which is used to set the default timezone used by all date/time functions in a script. This function returns False if the timezone is not valid, or True otherwise. Syntax:
bool date_default_timezone_set( $timezone_identifier )
Parameters: This function accepts single parameter $timezone_identifier which is mandatory. This parameter set the timezone identifier, like UTC or Asia/Kolkata. Return Value: This function returns False if the timezone_identifier is not valid, or True otherwise. Below programs illustrate the date_default_timezone_set() function in PHP: Program 1:
<?php
  
// Set timezone
date_default_timezone_set('Asia/Kolkata');
  
// Create 
$timezone_object = date_default_timezone_get();
  
// Compare the timezone with ini-set timezone
if (strcmp($timezone_object, ini_get('date.timezone'))){
    echo 'Script timezone differs from ini-set timezone.';
} else {
    echo 'Script timezone and ini-set timezone match.';
}
?>

                    
Output:
Script timezone differs from ini-set timezone.
Program 2:
<?php
  
// Set the timezone
date_default_timezone_set('Asia/Dubai');
  
// Create the timezone object
$timezone_object = date_default_timezone_get();
  
// Compare the timezone with ini-set timezone
if (strcmp($timezone_object, ini_get('date.timezone'))){
    echo 'Script timezone differs from ini-set timezone.';
} else {
    echo 'Script timezone and ini-set timezone match.';
}
?>

                    
Output:
Script timezone differs from ini-set timezone.
Related Articles: Reference: http://php.net/manual/en/function.date-default-timezone-set.php

Last Updated : 14 Sep, 2018
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