Time of attendace online can be set by the user

I’m making an online attendance application, but after the passage of time. there is still a gap that is, the time captured by the appsheet is the time on the device. and the time on the device can be set by the user, how do you prevent the time from being set by the user, and still use the server clock time

Not possible.

@Steve , can u tell me. How can i do usu time server

Not possible. AppSheet always and only uses the device time as the time source.