How-To-Test-If-A-Date-Is-On-A-Weekend How To Test If A Date Is On A Weekend



Generic Formula

Date – This is the date which you want to test if it’s a weekend.

What It Does

This formula will test a given date to see if it’s a weekend (Saturday or Sunday) and return TRUE if it is a weekend and FALSE if it is not a weekend.

How It Works

The WEEKDAY(Date) function will return a number from 1 to 7 depending on what day of the week the date is.

  • Returns 1 when the date is on a Sunday
  • Returns 2 when the date is on a Monday
  • Returns 3 when the date is on a Tuesday
  • Returns 4 when the date is on a Wednesday
  • Returns 5 when the date is on a Thursday
  • Returns 6 when the date is on a Friday
  • Returns 7 when the date is on a Saturday

To find the weekend we need to test if WEEKDAY(Date) equals 1 or 7 which means either a Saturday or a Sunday. WEEKDAY(Date)={1,7} has three possible outcomes.

  • {TRUE,FALSE} if the Date is on a Sunday
  • {FALSE,TRUE} if the Date is on a Saturday
  • {FALSE,FALSE} if the Date is any other weekday

When we apply the OR function to any of these arrays we will get TRUE if the array contains any TRUE values and FALSE otherwise. This happens only when the date is either a Saturday or Sunday.

In our example WEEKDAY(“2017-09-30”)={1,7} results in an array of {FALSE,TRUE} since “2017-09-30” is a Saturday. OR({FALSE,TRUE}) results in TRUE and therefore the date was a weekend.