Any time you want to know what time it is. If I have missed the dating, or if it is the mealtime for my three months child. The RTC module can provides you a real-time clock. You can make the controller to ask the module: hi,buddy, what time it is. At the same time, Donot forget to install a small coin cell which can serve you for more than six months.
24C32 32K I2C EEPROM memory
DS1307 based RTC with CR2032 battery (Battery included)
Fully charged, it can provide the DS1307 timing 1
Compact design, 27mm * 28mm * 8.4mm
Leads to the a DS1307 clock pin, to provide the clock signal for the microcontroller