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PHP Manual [date_default_timezone_set]

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PHP Manual || Date/Time Functions

(PHP 5 >= 5.1.0, PHP 7)

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.


Since PHP 5.1.0 (when the date/time functions were rewritten), every call to a date/time function will generate a E_NOTICE if the timezone isn't valid, and/or a E_WARNING message if using the system settings or the TZ environment variable.

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.



The timezone identifier, like UTC, Africa/Lagos, Asia/Hong_Kong, or Europe/Lisbon. The list of valid identifiers is available in the List of Supported Timezones.

Return Values

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 (
'Script timezone differs from ini-set timezone.';
} else {
'Script timezone and ini-set timezone match.';


Version Description
5.3.0 Now throws E_WARNING rather than E_STRICT.
5.1.2 The function started to validate the timezoneID parameter.

See Also

PHP Manual || Date/Time Functions