Device and method for tracking time zone changes in communications devices

A method of automatically updating a clock and a calendar program containing calendar activities that include time-specific appointments of a portable device comprising steps of:

• storing travel information specific to anticipated travel of said portable device;
• identifying occasions on which said anticipated travel includes travel among time zones;
• and
• automatically changing said clock and said calendar activities in response to detecting that a time indicated by said clock has at least reached timing of one of said occasions, including varying said clock and said calendar activities based upon occurrences of said anticipated travel.

A method of automatically updating a clock and a calendar program having calendar activities of a portable device comprising steps of:

• maintaining an internal time-of-day clock;
• maintaining a calendar program to include time sensitive reminders and alarms and information indicative of geographical locations in which said portable device is anticipated to be as of specific dates;
• automatically adjusting said time-of-day clock based upon said information of said calendar program, including changing said time-of-day clock in response to detecting that a specific date has been reached on which a change in said geographical location of said portable device results in a change in time zones;
• and
• displaying both said automatically adjusted time-of-day clock and an unadjusted reference time-of-day clock that is indicative of time that is tracked in isolation of said step of automatically adjusting.