A summary of the September 2025 Power BI updates

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Power BI Desktop updates for September 2025 Part one of a four-part series of blogs
The big changes in this month's update are two preview features which will change the working lives of DAX authors when released: a new way of creating calendars and the ability to write functions in DAX. A summary of the September 2025 Power BI updates (this blog) The enhanced DAX time intelligence calendar features in Power BI Writing DAX functions Button, list and text slicers

Power BI Desktop updates for September 2025

Part one of a four-part series of blogs

The big changes in this month's update are two preview features which will change the working lives of DAX authors when released: a new way of creating calendars and the ability to write functions in DAX.

A summary of the September 2025 Power BI updates (this blog)
The enhanced DAX time intelligence calendar features in Power BI
Writing DAX functions
Button, list and text slicers

Posted by Andy Brown on 25 September 2025

This is an update which introduces two preview features which will make the lives of DAX developers very different:

Feature	Notes
Enhanced DAX time intelligence	It's now much easier to work with non-standard calendars, and you can also work with weeks as a time unit.
DAX functions	Those comfortable with programming can now create DAX functions to make their coding more efficient.

It wasn't officially announced, but the update also has added list and text slicers by default to the visualisations pane, even though they are still theoretically in preview.

Parts of this blog
A summary of the September 2025 Power BI updates (this blog) The enhanced DAX time intelligence calendar features in Power BI Writing DAX functions Button, list and text slicers