RTC is an electronic device in the form of an Integrated Chip (IC) available in various packaging options. The purpose of an RTC or a real-time clock is to provide precise time and date which can be used for various applications. We have DS3231, DS1307, DS1302, SeeedStudio RTC module available. The RTC module is ideal in any time-critical applications like attendance systems, digital cameras, automated sprinkler systems, or a time and calendar display.