Versions Earlier Than V100R006

The system clock of the switch is implemented by the software. The system saves the system clock if the switch is powered off and restarted manually. If the switch is powered off due to a power failure, the system time is restored to the factory setting.

V100R006 And V200R001

The system clock of the S3300HI&S5300HI&S6300 is implemented by the hardware. The system obtains the clock from the hardware if the switch is powered off and restarted manually. The system clock of other models except the S3300HI&S5300HI&S6300 is implemented by the software. The system saves the system clock if the switch is powered off and restarted manually. If the switch is powered off due to a power failure, the system time is restored to the factory setting.

V200R002 And V200R003
The system clock of the S5300HI&S6300 is implemented by the hardware. The system obtains the clock from the hardware if the switch is powered off and restarted manually. The system clock of other models except the S5300HI&S6300 is implemented by the software. The system saves the system clock if the switch is powered off and restarted manually. If the switch is powered off due to a power failure, the system time is restored to the factory setting.

Good sharing, thank you