Time Zone Services (device-side) collection provides functionality related to time zone changes and database of world cities. It provides a Time Zone Server that allows clients to convert between UTC and local wall-clock time, and vice-versa, set the phone user-time zone, automatically adjust the local time on DST rule change and a provision to update the time zone database by means of upgrade package installation.
It also provides the Time Zone Localization component, which maintains a database that caches frequently used time zones.