US Patent 9134427 Determination of time zone and DST participation

A local time zone setting for a device is automatically provided based on a location and a date and time. Location information is obtained for a present location of the device within a geographical area and the date and time. An association is established between the present location and a geopolitical portion of the geographical area, the geopolitical portion including time zone application rules. The local time zone setting is automatically provided based on the time zone application rules, which can include daylight savings time (DST) participation, and the present date and time.