Before revision: 300px|Dallas Semiconductor DS1287 real-time clock manufactured in 1988300px|Types of hobbyist RTC modules commercially available from China A real-time clock (RTC) is an electronic device (most often in the form of an integrated circuit) that measures the passage of time.
After revision: A real-time clock (RTC) is an electronic device (most often in the form of an integrated circuit) that measures the passage of time.