Hi,
I didn't say those two systems are related directly. I just told you time of those two machines are not same.
Eg. Employee punch in 8:00 AM biometric record the time as 8:00 AM. Then it's upload in ZTABLE. But here upload time is only related to your system time. If system time is 7:30 then upload time shows 7:30 not 8:00 AM.
I think you got my point.
Thannks