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<concept id="GUID-4FCF605D-52D9-5B2D-80CF-80C940F680CA" xml:lang="en"><title>Time Zone Services</title><prolog><metadata><keywords/></metadata></prolog><conbody><p> 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. </p> <p>It also provides the Time Zone Localization component, which maintains a database that caches frequently used time zones.</p> </conbody></concept>