Data Usage monitor malfunction

A couple of days ago the Data Usage monitor on my S3 stopped working. Instead of showing todays dates, it began by defaulting to a date in 2015, then 2029. If I scroll down to todays date, it show no data usage. My date and time are set correctly on my phone. I'm using version 4.1.2. I can't find anything on the net about this or how to correct it, so any ideas would be much appreciated. After this started happening with the built in app, I downloaded Onavo Count, and it seems to be working correctly, but if there is anyway to get the built in app working again, that would be much appreciated.