PHP date_default_timezone_set() Function: Description, Parameters, Return Value, and Example

The date_default_timezone_set() function in PHP sets the default timezone used by all date and time functions within a script.

Signature: bool date_default_timezone_set(string $timezone_identifier) Parameter: $timezone_identifier – a timezone identifier such as UTC or Europe/Lisbon.

Return value: Returns TRUE on success; returns FALSE if the provided identifier is invalid.

Example usage:

<?php
date_default_timezone_set('America/Los_Angeles');
$script_tz = date_default_timezone_get();
if (strcmp($script_tz, ini_get('date.timezone'))){
    echo 'Script timezone differs from ini-set timezone.';
} else {
    echo 'Script timezone and ini-set timezone match.';
}
?>

The script sets the timezone to America/Los_Angeles, retrieves the current script timezone, compares it with the timezone defined in php.ini, and outputs a message indicating whether they match.

Sample output:

Script timezone differs from ini-set timezone.