Explanation
The WORKDAY.INTL function is normally used to find dates that are workdays. For example, you can use WORKDAY.INTL to find the next workday that is not a weekend or holiday, or the first workday 5 days from now.
One of the the arguments provided to WORKDAY.INTL is called "weekend", and controls which days are considered non-working days. The weekend argument can be provided as a number linked to a preconfigured list, or as a 7-character code that covers all seven days of the week, Monday through Saturday. This example uses the code option to "filter out" days that are not Tuesdays or Thursdays.
In the code, 1's represent weekend days (non-working days) and zeros represent work days, as illustrated with the table in D4:K9. We only want to to see Tuesdays or Thursdays, so we use zeros for these days, and 1's for every other day:
=WORKDAY.INTL(B5,1,"1010111")
As the formula is copied down, the WEEKDAY.INTL outputs only Tuesdays or Thursdays. All dates are formatted with the custom number format " ddd d-mmm-yyyy".
Custom days
To customize which days are returned, just adjust the code. For example to output only Mondays, Tuesdays, or Fridays, you can use:
=WORKDAY.INTL(B5,1,"0101011")
