D-Link DIR-822 User Manual page 180

DIR-822 AC1200 Wave 2 MU-MIMO Wi-Fi EasyMesh
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 Internet. 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