After using DS1307's, which for the most part are right at least twice a day, I migrated to DS3231's. These are vastly superior in every way. But eventually, I was looking at my GPS modules just sitting there doing nothing and I decided I'd build a master time server for the house.
So I used a GPS, RF, and Arduino to make the house time server. No network connection required.
And then the completed project:
Obviously I have too much time on my hands...