AUTOMATIC TIME ZONE DETECTION IN DEVICES

摘要

Methods, systems, apparatuses, and computer program products are provided for enabling devices to determine the time zone in which they are located. A mobile device may receive location information from one or more sources. Based thereon, the current location of the mobile device may be determined in terms of latitude and longitude. The indication of the current location may be converted to an index value according to a Hilbert curve (or other space-filling curve), and the index value applied to a time zone index file to determine the local time zone. A time zone setting of the mobile device may be updated accordingly. Furthermore, “geofencing” may be used by the mobile device to detect movement towards and through a time zone boundary, leading to a new time zone determination being initiated.

主权项

1. A method in a computer, comprising:
receiving map data defining a world map as an array of polygons with associated time zones; determining a time zone identifier array based on the map data that includes a time zone identifier for each time zone identified in the map data; for each time zone, analyzing each polygon of the array of polygons included in the time zone to generate a set of cells associated with the time zone, thereby generating a plurality of sets of cells associated with the time zones; eliminating duplicate cell entries in the plurality of sets of cells associated with the time zones; and generating a time zone index file that includes the plurality of sets of cells with corresponding time zone identifiers.