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The Essential Guide to SAS Dates and Times
SAS has three separate counters that keep track of dates and times. The date counter started at zero on January 1, 1960. Any day before 1/1/1960 is a negative number, and any day after that is a positive number. Every day at midnight, the date counter is increased by one. The time counter runs from zero (at midnight) to 86,399.9999, when it resets to zero. The last counter is the datetime counter. This is the number of seconds since midnight, January 1, 1960. Why January 1, 1960? One story has it that the founders of SAS wanted to use the approximate birth date of the IBM 370 system, and they chose January 1, 1960 as an easyto-remember approximation.
Many database programs maintain their dates as a value relative to some fixed point in time. This makes calculating durations easy, and working with dates stored in this fashion becomes a matter of addition, subtraction, multiplication, and division.
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