Create Calendar Table Using Power Query

Introduction

A calendar table is a useful tool in data modeling that can be used to analyze data over time periods. It can be created in Power Query, a data transformation and cleansing tool within Power BI.

Here are the steps to create a calendar table in Power Query.

Step 1. Open Power Query Editor Open Power BI and click on the "Transform Data" button to open Power Query Editor.

Step 2. Create a new query In Power Query Editor, click on "New Source" and select "Blank Query" from the drop-down menu.

Step 3. Open ‘Advanced Editor’.

Step 4. Enter the M code given below in the advanced editor.

let

StartDate = #date(2020, 1, 1), // Enter your own start date

EndDate = #date(2022, 12, 31), // Enter your own end date

NumberOfDays = Duration.Days(Duration.From(EndDate - StartDate)),

Source = List.Dates(StartDate, NumberOfDays + 1, #duration(1, 0, 0, 0)),

TableFromList = Table.FromList(Source, Splitter.SplitByNothing(), {"Date"}, null, ExtraValues.Error),

ChangedType = Table.TransformColumnTypes(TableFromList, {{"Date", type date}})

in

ChangedType

This M code defines the start and end dates for the calendar table, creates a list of dates, and then transforms the list into a table.

Note. Replace the start and end dates in the code with your own desired dates.

Step 5. Name the query "Calendar Table" or any other name you prefer and save the query. Click on "Close & Apply" to save the query.

Step 6. Use the calendar table in Power BI Once the query is saved, the calendar table can be used in Power BI by creating relationships with other tables that have date columns. This allows users to analyze data over time periods such as days, weeks, months, or years.

Conclusion

Creating a calendar table in Power Query is a simple process that can be done in a few steps. The resulting table can be a valuable tool in data modeling and analysis in Power BI.