I thought it might be that, but I can't recall that particular station ever broadcasting an RDS signal and I know the RDS indicator wasn't on. (Is there still an RDS indicator?)
I've only seen one station in the Austin area broadcast an RDS signal and it had call leters and the time off by a few minutes, not by 6 hours, so that's why I was thinking it was some type of timer indicating something like hours of use since last time the kernel was flashed or something...