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This has been going on for at least a day now in the Cleveland Ohio area. The wrong time is being sent from COX in the Caller Id data. Currently it is 11:30 PM but COX is sending 9:30 AM as the time.
This has been reported by others on the DSL Reports forums too: www.dslreports.com/.../r32206313-FL-COX-Voice-sending-incorrect-time
Have you tried rebooting the phone modem?
Rebooting of the phone modem made no difference. I even unplugged the phone modem, removed the internal battery, and let it sit for a couple minutes before reseating the battery and plugging in the power cord. Time is still completely hosed.