Hi Carsten,
Swisslog reads the time difference to UTC automatically according your Windows Zone settings. If there is a mismatch with the time difference defined in your MyQTH it will release a message informing to fix this. You have to define time difference values with no positive or negative symbol. Simply set the hours of difference. Make sure you have defined correctly your time zone in Windows!
In order to log UTC, you have to check the "Store UTC in logbook" and check also "Realtime QSO Entry" in the Options of the Add QSO window. Date field will become yellow. You can switch from realtime to manual entry easily by double cliclink on the date field. White background means "manual entry". Please read:
http://www.swisslogforwindows.com/englis...%20QSO.htm
73