D-Link DIR-825/AC User Manual page 213

DIR-825/AC Wireless AC1200 Dual Band Gigabit Router
User Manual
When the router is powered off or rebooted, the system time is reset to the default value.
!
If you have set automatic synchronization for the system time, the internal clock of the
device will be configured after connecting to the Inter net. If you have set the system time
manually, you need to set the time and date again (see above).
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Configuring via Web-based Interface