In year 1974, the CASIOTRON was the world's first digital watch with automatic calendar. The CASIOTRON won acclaim as a groundbreaking product that represented a complete departure from the conventional wristwatch. Casio was able to create a watch that displayed the precise time including the second, minute, hour, day, and month - not to mention a.m. or p.m., and the day of the week. It was the first watch in the world with a digital automatic calendar function that eliminated the need to reset the calendar due to the variation in month length.
