Ancient people assessed time via their “biological clock” that has a 24-hour pulse. Around 9,000 years back the Sumerians, a primeval civilization in Mesopotamia, made the hour number system with the essential figures of 6, 24 and 60. The Sumerians become the foremost people who provided the day 24 hours at 60 minutes. The first genuine clocks were sundials, which were utilized by the Sumerians and other civilizations. The Chinese people possibly had the first alarm clock.