The unit of time, is one of the 7 basic units. Time is a parameter used by humans to describe the process of material movement or the occurrence of events. Determining time relies on the law of material cycle changes independent of external influences. The system of time measurement based on the rotation of the Earth is called the world time system. The time measurement of hours, days, months, years and centuries belongs to the calendar category in astronomy. This time converter provides conversions between time units such as seconds, minutes, hours, days, weeks, months, and years.