When the router connects to internet, it will be changed automatically via Internet.

It's in Range Extender Mode on an open public wifi, so effectively the router has internet access already but is not updating the system time?

you can click Get from PC, but it won't get from internet or GMT. working as extender, there isn't WAN gateway, the NTP server would not update

flying snow wrote

you can click Get from PC, but it won't get from internet or GMT. working as extender, there isn't WAN gateway, the NTP server would not update

Where can see in menu system?

There is not Time settings when the 802N works in extender mode. It's available in router mode. so I think log time has nothing to do with the system time. As for why it shows the time as 2015, I don't know either. As long as it works fine, we don't need the log to analyze anything. If it does something bad, then you can send it to tplink support.