Apple II system clocks, also known as real-time clocks, were devices in the early years of microcomputing. A clock/calendar did not become standard in the Apple II line of computers until 1986 with the introduction of the Apple IIGS.
In the early days of personal computing, Apple II system timekeeping devices were prevalent. It wasn't until 1986 that a built-in clock/calendar became a standard feature in the Apple II line with the release of the Apple IIGS.