By cons I had a little trouble to use,
The first library tested "DS1307" gave me the circuit diagram too but compilation errors to make it work. I've tested a second also in vain and it is with a third as I came out more easily (although there were still some errors) I give it is DS1307RTC.
The two examples are simple to adapt to change has its own needs.
In conclusion, I am satisfied, but I could have won a good two hours with the good leads from the start.
