SparkFun DeadOn RTC Breakout (BOB-10160) Arduino library for the SPI-based DS3234 real time clock (RTC). Allows you to set and read the time and date, set both alarms, and configure the SQW output pin ...

You must, first of all, upload the "TimeRTCSet.pde" example of the Time library (obviously to set the time on DS1307 RTC), then you can upload my sketch. Check connections between Arduino and LCD, ...

The most popular RTC for the Arduino is the DS1307. However, it does have some drawbacks, the most notable of which is that its operating voltage is 5v, which means it cannot be used with 3.3v ...