Is it possible to detect change of date and/or resume from standby?

Hallo you all,
in our current project we have a java remote application and a server application connected via GPRS.
Both client and server must have a system time sinchronized with a tolerance of maximum 15 minutes.
The problem has been solved simply making a datetime check during login: server sends it's current datetime
to client and then client make the time check. All right.
The problem is that after login the user (on client app) is able to change the system time and then... the sinchronization is lost!!
My first solution: I have a background thread that each 5 seconds make a time check: if in two consecutives checks
the difference is greater that 15 mins then I assume the the user has changed the system datetime and I raise a non recoverable exception
and the client aplication is closed.
Problem: if the system goes in stand by (laptop or hand held device) then at resume I have a time difference that can be greather than 15 mins.
Question: is there a way to understand if system wake up from stand by or if a system time has been changed?
In my tests the case of system date change and the case of sysm resume from stand by are identical from point of view value of Java current date.
I found no real to this question...
Thanks in advance,
Franco.

It sounds like you're trying to synchronize multiple system clocks.
Why not using an existing solution such as NTP for this?
It sounds as if your application is trying to do many things at once.

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