NTP
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Short for Network Time Protocol, an Internet standard protocol (built on top of TCP/IP) that assures accurate synchronization to the millisecond of computer clock times in a network of computers.
If enabled, NTP will attempt to contact one of four NTP server(s) on the Internet or alternatively NTP will contact a nominated NTP server based on the entered Server IP address. NTP attempts to contact a NTP server (on Router boot) every 30 seconds to set the correct time/date for the router then after successfully contacting the NTP server, the router will continue to reattempt to recontact the NTP server hourly.
NTP returns current UTC plus/minus the timecorrection factor specified in Time Zone