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(PHP 5 >= 5.1.0, PHP 7, PHP 8)

date_default_timezone_set Sets the default timezone used by all date/time functions in a script


date_default_timezone_set(string $timezoneId): bool

date_default_timezone_set() sets the default timezone used by all date/time functions.

Instead of using this function to set the default timezone in your script, you can also use the INI setting date.timezone to set the default timezone.

Elenco dei parametri


The timezone identifier, like UTC, Africa/Lagos, Asia/Hong_Kong, or Europe/Lisbon. The list of valid identifiers is available in the elenco delle Timezone supportate.

Valori restituiti

This function returns false if the timezoneId isn't valid, or true otherwise.


Example #1 Getting the default timezone


$script_tz = date_default_timezone_get();

if (
strcmp($script_tz, ini_get('date.timezone'))){
'Script timezone differs from ini-set timezone.';
} else {
'Script timezone and ini-set timezone match.';

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