Windows likes local time on the RTC. Way back when DOS 1.0 was released (every story about Windows begins with this) there was one way to set the system clock: the user would type in the time. They would use the local time, of course. Consistency with other systems didn't mean diddly squat on a PC/XT with 256 KB of RAM, a floppy drive, and a keyboard. Fast forward a million tech years and we all live with the legacy.