There are many ways the clock on your Palm-compatible device can change. You can change it yourself using the built-in Prefs program. There are travel and clock utilities that update your system clock as you move from location to location. Some smartphones automatically update the clock via the wireless network as you move from time zone to time zone. Palm OS versions 4.0 and later also have a time zone preferences setting. When you change your time zone, the system clock is changed to reflect the new time zone. TimeWarp automatically changes some or all of your appointment times when your system clock changes. You control which appointments get adjusted. You can have it confirm with you before making any DateBook changes. You also specify the minimum number of minutes the clock has to change before TimeWarp attempts to do anything. This prevents it from making any changes in the event of minor clock adjustments.