This feature automatically updates the system clock for annual daylight savings time changes. This feature is only supported in North American locales.
1.Click on System in the menu bar and then click on Switch.
2.Click the Advanced button.
3.In the System Details panel, set the Automatic DST option as required. When enabled, the telephone system will automatically apply daylight saving time (DST) adjustments to its internal clock. This feature should only be used for systems in a North American locale.