1.20.x date.inc | date_timezone_is_valid($timezone) |
Determines if a timezone string is valid.
Parameters
string $timezone: A potentially invalid timezone string.
Return value
bool: TRUE if the timezone is valid, FALSE otherwise.
File
- includes/
date.inc, line 773 - Date API functions and constants.
Code
function date_timezone_is_valid($timezone) {
static $timezone_names;
if (empty($timezone_names)) {
$timezone_names = array_keys(date_timezone_names(TRUE));
}
return in_array($timezone, $timezone_names);
}