function date_timezone_is_valid in Date 7

Same name and namespace in other branches

1. 5.2 date_api.module \date_timezone_is_valid()
2. 6.2 date_api.module \date_timezone_is_valid()
3. 7.3 date_api/date_api.module \date_timezone_is_valid()
4. 7.2 date_api/date_api.module \date_timezone_is_valid()

1 call to date_timezone_is_valid()

date_ical_parse_date in date_api/date_api_ical.inc

Parse a ical date element.

File

date_api/date_api.module, line 1286

This module will make the date API available to other modules. Designed to provide a light but flexible assortment of functions and constants, with more functionality in additional files that are not loaded unless other modules specifically include them.

Code

function date_timezone_is_valid($timezone) {
  static $timezone_names;
  if (empty($timezone_names)) {
    $timezone_names = array_keys(date_timezone_names(TRUE));
  }
  if (!in_array($timezone, $timezone_names)) {
    return FALSE;
  }
  return TRUE;
}