date_default_timezone_set

Function • Params and return types changed in PHP 8.0

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

PHP 5

PHP 7

Improved

PHP 8.1

PHP 8.2-8.3

PHP 8.4

PHP 8.5

PHP 8.6

date_default_timezone_set(string $timezoneId): bool

Typestring

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

Typebool

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

Changes to the `date_default_timezone_set` Function

Return type added: bool
Parameter name of parameter #1 changed: $timezone_identifier to $timezoneId
Parameter type added for parameter #1 ($timezoneId): string

- date_default_timezone_set($timezone_identifier)
+ date_default_timezone_set(string $timezoneId): bool