to reset date, put your phone in airplane mode for about 10 seconds. After you counted to 10 using all your fingers (maybe a toe or 2 if your missing some fingers), then take it off airplane mode, and date should come back into service.
As for the 3G service, it is stated above, if you done see that EVDO, then it has switched out of 3G and onto just a regular old digital phone service a.k.a 2G or whatever Sprint runs for their regular non 3G radio.