## 5.4 Daylight Saving Time

DST, also called Daylight Saving Time, is a system that prescribes the local time setting principle in order to save energy. The unified time adopted during the system date is called ¡°DST¡±. Usually, the time will be one hour forward in summer. It encourages people to go to bed early and wake up early in order to reduce lighting and save energy. In autumn, the time will be recovered. The regulations are different in different countries.

To meet the demand of DST, a special option can be customized on this system. Set the time one hour forward at XX (minute) XX (hour) XX (day) XX (month), and make the time one hour backward at XX (minute) XX (hour) XX (day) XX (month) if necessary.

? Note: If a DST setting is in use, it can not be deleted. First stop the DST then delete it again.

1. DST Adding:

Set as "Month-Weeks-week hour: minute" format. The start time and end time is in need. For example, the start time can be set ¡°second Monday in March, 00:00¡± When the start time arrives, the system will be advanced one hour. When the end time arrives, the system will turn back to the original time.

2. DST Using:

The user can enable the DST setting on a device, by the following ways:

In the DST interface, select a DST setting, and click [Daylight saving time setting], select the device to apply the DST setting to and click [OK] to confirm.

Otherwise, in the [Access Control] – [Door Configuration] interface, select the device, and click [Enable Daylight Saving time] or [Disable Daylight Saving Time] to set.

If a DST setting is in use, the latest modification will be sent to the device. The device disconnect will lead to transmission failure, and it will continue transmit at the next connection.

In the Door Management module of the access control system, you can enable or disable DST function. If you enable DST setting, when the start time arrives, the system will be advanced one hour. When the end time arrives, the system will turn back to the original time. If you have not set a DST in the device, when you disable DST, the system will prompt ¡°The Daylight Saving Time hasn¡¯t been set in this device¡±.