5 hour difference & you live in Iowa, Central Time, UTC -0500.
Sounds to me like you're getting hit by the fact that M$ defaults to setting hardware clocks to local time, while *nix systems normally use UTC & then adjust to local, including daylight time. Is your FC4 server set to use UTC on the hardware (BIOS) clock?
might be helpful in determining this. Otherwise, you will have to reboot & run the BIOS Setup routine to see what is actually happening.
There is always a chance that SyncBack is at fault, either a bug, or more likely it is not configured for Linux & its UTC clock. Please double check their docs to see if that is the problem.
Finally, according to my printed copy of
The Official SAMBA-3 HOWTO and Reference Guide, adding something like "time offset = 300" to your smb.conf may help.
Reacp[list=1][*]What time zones are you PC's BIOS clocks set for?[*]Which of the time stamps is correct -- MS or Linux?[*]What do the SyncBack docs say about Samba & Linux?[/list=1]