System Time

Context

Generally, the daylight saving time (DST) is configured in the summer, and the DST ranges from one day to one year. Therefore, the end time of daylight saving time must be more than one day but less than one year later than the start time.

To ensure effective communication between the switch and other devices, set the system time correctly.

Procedure

Time Zone Settings

Choose Maintenance > System Maintenance > System and click the System Time tab.

Select a time zone from Select time zone and set DST to ON.

Table 1 describes parameters on the page.

**Table 1** DST parameters
Parameter	Description
The following parameters are valid only when DST Type is set to Absolute.
Effective time	Specifies the start and end time of the absolute DST.
DST difference	Specifies the DTS difference. The offset should be shorter than or equal to 2 hours.
The following parameters are valid only when DST Type is set to Timely.
Start time	Select By week or By date to set the start time of DST.
End time	Select By week or By date to set the end time of DST.
DST difference	Specifies the DTS difference. The offset should be shorter than or equal to 2 hours.
Start and end years	Specifies the start and end years of a periodic DST.

After setting the parameters, click Apply.

Date and Time Settings
Choose Maintenance > System Maintenance > System and click the System Time tab.

Current system time displays the current date and time.
- Automatic synchronization
  1. Click Auto.
  2. Set NTP server IP address and click Add to specify a remote NTP server.
  3. Click Apply to complete the configuration.
- Manual setting
  1. Click Manual.
  2. Set Date and Time.
  3. Click Apply to complete the configuration.
  The new date and time is displayed.
  - If the new time is 10 minutes later or 720 hours earlier than the scheduled reboot time, the system will display a message, asking whether you want to disable the scheduled restart function.
  - If the system time is changed to no more than 10 minutes later than the scheduled restart time, the system will display a message, asking whether you want to restart the device immediately.