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A great advantage of storing dates and times as sas numeric date and time values is that: In addition to tracking time intervals, SAS date and time values can be used in calculations like other numeric
How Does SAS Work? (January 1, 1960 and Midnight as Zero)
SAS has three separate counters that keep track of the date and time. The date counter starts at zero on January 1, 1960.
Any date before January 1, 1960 is a negative number, and any date after is a positive number. Every day at midnight, the day counter is incremented by one.
The timer goes from 0 (at midnight) to 86,399.9999, when it is reset. The last counter is the datetime counter. This is the number of seconds since midnight, January 1, 1960. Why January 1, 1960? One story goes that the founders of SAS wanted to use the IBM 370 system's approximate date of birth, and they chose January 1, 1960 as an easy-to-remember approximation.
Many database programs maintain their date as a value relative to a fixed time. This makes time calculations easier and working with dates stored this way becomes a matter of addition, subtraction, multiplication and division operations.
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