Odd, while daylight saving time ended last month for me (or started i never know which is the real one), I did notice mirc was showing the same tme as the window clock, but theni must admit I didnt see it actually adjust as the time went over.
I could see a reason mirc would keep its clock out of sync untill a restart, there maybe timer even issues, and also activity issues, and maybe logging ones, that were decided that it would be better to just side step by not adjusting time when the system did it, and only do it when user does it, of course you must take an initial time sample at some time so u do it when u start. (just an opion of course)