this is normal and expected because you are not configuring the hardware clock
you must use calendar command to do this
but i am not sure if it is supported by your switch
calendar set
To manually set the hardware clock (calendar), use one of the formats of the calendar set command in EXEC mode.
calendar set hh:mm:ss day month year
calendar set hh:mm:ss month day year
Usage Guidelines
Some platforms have a hardware clock that is separate from the software clock. In Cisco IOS software syntax, the hardware clock is called the "calendar." The hardware clock is a battery-powered chip that runs continuously, even if the router is powered off or rebooted. After you set the hardware clock, the software clock will be automatically set from the hardware clock when the system is restarted or when the clock read-calendar EXEC command is issued. The time specified in this command is relative to the configured time zone.
Examples
The following example manually sets the hardware clock to 1:32 p.m. on May 19, 2003:
Router# calendar set 13:32:00 May 19 2003
Related Commands
Command | Description |
|---|
clock read-calendar | Performs a one-time update of the software clock from the hardware clock (calendar). |
clock set | Sets the software clock. |
clock summer-time | Configures the system time to automatically switch to summer time (daylight saving time). |
clock timezone | Sets the time zone for display purposes. |
clock update-calendar | Performs a one-time update of the hardware clock from the software clock. |
