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Real Time Clock (RTC) Module. This handy module keeps accurate time for years using a tiny coin-cell, and is very simple to connect to your Arduino project. A driver library allows your program to easily set or read the time and date. Perfect for clock projects, dataloggers or anything that needs to know the date and time. Features.
Software clock vs Hardware clock. The system clock, provided by the kernel, is implemented as a simple count of the number of ticks that have transpired since the 1 January 1970 00:00:00 UTC. This is called Unix time. The hardware clock (also known as real-time clock or RTC) is typically a component on the mainboard.