I tried setting the WinCe time ahead by 10 hours but it jumps back, no matter what I set it to. Time Jump patch doesn't help this.
So.
In the wince side leave the timezone as it is, and set only the time and date!!!!!!!
Put this lines in igo sys.txt file, erasing your matching old ones:
[timezone]
sync_os_timezone=0
reset_os_timezone=0
You can also edit the second config file for igo (sistem.ini) from "save" folder and verify if you have this lines in:
[timezone]
tzdst="1"
auto_index="296"
sync_time="0"
use_auto="0"
index="3"
I have igo 8.3.4 with this settings and it works fine, no time jump!!!
good luck.