So, since the time change might change 1 month earlier and 1 month later does that affect RC4?I think it is an excellent idea. I jog and that will make light that much more. Time will tell. JimCYWG

I don't see how. RC gets its info (zulu time, etc) from FSUIPC which get its info from MSFS. The only thing that would have to be updated are the timezone files by Dennis Thompson that fix the timezone errors in MSFS.Otherwise, the only other effect the DST extention will have is that JD will be able to program in daylight a little longer!! :-)