Which SAS function would be appropriate for finding out which day of the week a date falls on?

The WEEKDAY() function is designed specifically to determine the day of the week that corresponds to a given date in SAS. This function returns a numeric value where each number corresponds to a specific day, with 1 typically representing Sunday, 2 representing Monday, and so on through to 7 for Saturday. This makes it straightforward to use when you need to ascertain the specific day of the week from a date input.

In contrast, the MONTH() function is used to extract the month portion of a date, returning a value between 1 and 12. The DAY() function retrieves the day portion of a date, providing a number between 1 and 31, depending on the date. The INTNX() function is utilized to compute a date that is a specified number of intervals away from a given date but does not directly indicate which day of the week a date falls on. Therefore, WEEKDAY() is the most suitable option for determining the day of the week.