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Custom weekday abbreviation

We can use the CHOOSE and WEEKDAY functions to make custom weekday abbreviations in any style we desire. We may want to, for example, format the days of the week to be abbreviated by the first letter or the first two letters. The steps below will walk through the process of creating weekday abbreviations.

Figure 1- Result of creating custom weekday abbreviations

General Formula




Setting up the Data

  • We will create our data titled “Date” in Column B
  • Column C is where we will insert the formula to arrive with the Weekday result.

Figure 2- Setting up the Data

Applying the CHOOSE and WEEKDAY functions

  • We will click on Cell C5
  • We will insert the formula below into Cell C5
  • We press the enter key

Figure 3- Applying the CHOOSE and WEEKDAY functions

  • We will click on Cell C5 again
  • Using the fill handle tool found at the bottom-right of Cell C5, we will drag and copy the formula into the other cells.

Figure 4- Result of using the CHOOSE/WEEKDAY formula to create custom weekday abbreviations


We use the CHOOSE and WEEKDAY functions together to customize the abbreviations of the days of the week in a way that suits us. In the illustrations above, we customized the days of the week to a single letter abbreviation.


  • =WEEKDAY(B5)


The WEEKDAY function simply takes a date and returns with a number between 1 and 7. By default, 1 represents Sunday, while 7 represents Saturday.


  • =CHOOSE(B5,“S","M","T","W","T","F","S")


The CHOOSE function matches the number extracted by using the WEEKDAY function to their corresponding positions in the days of the week and returns with the follow-up arguments in that regard as specified by the list of abbreviations contained within the CHOOSE formula.

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Another blog reader asked this question today on Excelchat:
Here are some problems that our users have asked and received explanations on

I need to reference a name off an abbreviation
Solved by D. B. in 16 mins
When I export phone numbers from my contact data base it does not include the company name, it only contains the company abbreviation code. My thought is too match the abbreviations with the correct company names in sheet 2 and then insert a blank cell beside the abbreviation in sheet 1 and auto populate the correct company name beside each contact. There are multiple contacts for each company and finding and replacing the abbreviation with the company name would take entirely too long. I do not know how to do this but just matching the correct abbreviation to the corresponding company name and then auto fill in the cell beside the abbreviation seemed like a logical idea. Thanks!
Solved by E. U. in 21 mins
Solved by I. C. in 24 mins

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