core-bundle/src/Resources/contao/library/Contao/System.php
public static function getTimeZones()
	{
		$arrReturn = array();
		$timezones = array();

		require __DIR__ . '/../../config/timezones.php';

		foreach ($timezones as $strGroup=>$arrTimezones)
		{
			foreach ($arrTimezones as $strTimezone)
			{
				$arrReturn[$strGroup][] = $strTimezone;
			}
		}

		return $arrReturn;
	}
public static function getTimeZones()
	{
		$arrReturn = array();
		$timezones = array();

		require __DIR__ . '/../../config/timezones.php';

		foreach ($timezones as $strGroup=>$arrTimezones)
		{
			foreach ($arrTimezones as $strTimezone)
			{
				$arrReturn[$strGroup][] = $strTimezone;
			}
		}

		return $arrReturn;
	}
Return the timezones as array

@return array An array of timezones