PLANET DVR-1672 - Manual (Page 51)

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5.9.2.3 Internet Time Setup
Synchronize your DVR time with internet time server.
Item Description
Automatic
Synchronization
Check to enable DVR automatic synchronization
function. Select this option to enable the function,
DVR will automatically synchronize the time upon
rebooting or by every 24 hours after booting.
Update Now
Date and Time show on DVR will immediately
correspond with those in internet server.