it is very easy! i used the way: button in wincc -> read systemtime of pc -> send values (sec,min,hour,day,mon,year) in sps. sort values in sps. use of SET_CLOCK in sps, press F1 for help. the problem is to get the wincc-code for getting the system-time: http://www4.ad.siemens.de/news/cs/de/5608138 (switch to english on top of page)