Patent ID: 7821875

Claim:
A method for updating a time marking in a portable electronic device, comprising: automatically detecting a location for at least one event stored in the portable electronic device based at least on a place code for the location associated with the at least one event, wherein the at least one event comprises a start time, two-way communicating with a network in order to obtain city related information for a current city in which the portable electronic device is currently located, determining, based on the city related information and on the location for the at least one event, whether there is a need for a time update in the portable electronic device with respect to the start time for the at least one event stored in the portable electronic device for the current city; automatically retrieving, in response to a determined need for a time update, city specific time rules from a database, wherein the time rules corresponding to said city related information comprise calculation rules and a start date and an end date of daylight saving time for the current city; and updating at least the start time for the at least one event stored in said portable electronic device according to said time rules.