Given the SAS data set WORK.ONE:
| N | BeginDate |
| 1 | 09JAN201 |
| 2 | 12JAN201 |
The following SAS program is submitted:
data WORK.TWO;
set WORK.ONE;
Day=<_insert_code_>;
format BeginDate date9.;
run;
The data set WORK.TWO is created, where Day would be 1 for Sunday, 2 for Monday, 3 for Tuesday, … :
| N | BeginDate | Day |
| 1 | 09JAN2010 | 7 |
| 2 | 12JAN2010 | 3 |
Which expression successfully completed the program and creates the variable Day?
A. day(BeginDate)
B. weekday(BeginDate)
C. dayofweek(BeginDate)
D. getday(BeginDate,today())
Answer: B
注解：WEEKDAY function returns an integer that corresponds to the day of the week, where 1=Sunday, 2=Monday, …, 7=Saturday, from a SAS date value. DAY function returns the day of the month. There is no function called DAYOFWEEK or GETDAY in SAS.