Billion Electric Co. Ltd. BIL-7401VGPR4 Manual De Usuario

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Here are the items within the System section: 

The router does not have a real time clock on board; instead, it uses the Simple Network Time 
Protocol (SNTP) to get the current time from an SNTP server outside your network. Choose your 
local time zone, click Enable and click the Apply button. After a successful connection to the Internet, 
the router will retrieve the correct local time from the SNTP server you have specified. If you prefer 
to specify an SNTP server other than those in the list, simply enter its IP address as shown above. 
Your ISP may provide an SNTP server for you to use.

Daylight Saving is also known as Summer Time Period. Many places in the world adapt it during 
summer time to move one hour of daylight from morning to the evening in local standard time. Check 
Enable box to set your local time.

Resync Period (in minutes) is the periodic interval the router will wait before it re-synchronizes the 
router’s time with that of the specified SNTP server. In order to avoid unnecessarily increasing the 
load on your specified SNTP server you should keep the poll interval as high as possible – at the 
absolute minimum every few hours or even days.