SAS: How to Get Day of Week from Date

You can use the following functions in SAS to get the day of the week from a date:

The WEEKDAY function returns the day of the week as a number (1, 2, 3, 4, 5, 6, 7).

The PUT function with the DOWNAME format returns the day of the week as a name (Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday).

The following example shows how to use each of these functions in practice.

Example: Get Day of Week from Date in SAS

Suppose we have the following dataset in SAS that shows the birth date for seven individuals:

/*create dataset*/
data original_data;
    format birth_date date9.;
    input birth_date :date9.;

/*view dataset*/
proc print data=original_data;

We can use the following code to create a new dataset that contains two new variables that show the day of the week as a number and the day of the week as a name for the birth date of each individual:

/*create new dataset*/
data new_data;
    set original_data;
    weekday_number = WEEKDAY(birth_date);
    weekday_name = put(birth_date, dowName.);

/*view new dataset*/
proc print data=new_data;

SAS day of week

The two new variables show the day of the week for each birth date as a number and as a name.

For example:

  • January 1st, 2021 is on a Friday, which is the 6th day of the week.
  • February 22nd, 2022 is on a Tuesday, which is the 3rd day of the week.
  • March 14th, 2022 is on a Monday, which is the 2nd day of the week.

And so on.

Additional Resources

The following tutorials explain how to perform other common tasks in SAS:

How to Use DAY, MONTH, and YEAR Functions in SAS
How to Convert Datetime to Date in SAS
How to Add Days to Date in SAS

Leave a Reply

Your email address will not be published. Required fields are marked *