SAS Date and Time Values
Definitions
SAS date value
is a value that represents
the number of days between January 1, 1960, and a specified date.
SAS can perform calculations on dates ranging from 1582 C.E. to
19,900 C.E.. Dates before January 1, 1960, are negative numbers; dates
after are positive numbers.
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SAS date values account for all leap year days, including the leap year day in the year 2000.
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SAS date values are based on the Gregorian calendar, and they are valid for the dates supplied above.
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Various SAS language elements handle SAS date values: functions, formats, and informats.
SAS time value
is a value representing
the number of seconds since midnight of the current day. SAS time
values are between 0 and 86400. 
SAS datetime value
is a value representing
the number of seconds between January 1, 1960, and an hour/minute/second
within a specified date. SAS makes adjustments for leap years, but
ignores leap seconds. SAS does not make adjustments for daylight saving
time.
Example: Date and Time Values
SAS stores date values
as numbers so that you can easily sort the values or perform arithmetic
computations. You can use SAS date values as you use any other numeric
values.
data work.test;
set cert.temp;
TotDay=enddate-startdate;
run;
proc print data=work.test;
run;Output 13.1 PROC PRINT Output of Work.Test (partial output)
Last updated: August 23, 2018
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