rtcds1307 + xbee + arduino didn't work

please help master, I plug in the DS1307 RTC Arduino + xbee and receiver using xbee adapter on the PC, but when I try with long distance, RTC read data into 165/45/2165 45:85:85 (RTC + Arduino + xbee I plug in the PC) and + xbee adapter plug in my laptop with a distance of about 5 meters, while at RTC + arduino + xbee xBee adapters and plug it all on my laptop, Data can be sent in the format 05/12/2013 14:19:58 hours now, why it can be like that ? whether the distance effect in the process of receiving data? or affect the voltage because I plug Arduino + RTC on pc? thank you