Unlike animals, human beings need structure in their lives. They need to know how long events occur, to predict when things will happen and to make arrangements with other humans that are time based. For all of this they need to measure time and communicate these measurements so that their lives are more ordered.
They also have an emotional need to celebrate or commemorate key events, such as birthdays, and a measurement of time that is reliable and widely understood enables this. A calendar is the result, and calendars have been used for thousands of years, probably more.
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