Power BI - Date Slicer Troubleshooting
Verifying the Date Column: As a first step, check that the date column being used in the slicer is formatted properly as a date in Power BI. If it is not recognized as a date, aspects of Power BI will treat it differently. You can check this by selecting the column in view data and checking that the data type is "Date" or "Date/Time."
Inspect the data models: Look into relations formed in the data model. Make sure that the date column in the slicer is attached to the other tables through one-to-many or many-to-mone relationships. If those are inactive or misconfigured, then the slicer will not filter the data as desired.
Consider the Date Range: Check your dataset for missing or incorrect date values. If the dates have gaps or limits, the slicer may not be able to represent the whole range. This can be solved by creating a continuous date table with all possible dates and linking that table to your data model. You can use a built-in date table from Power BI itself or build one on your own using the DAX functions CALENDAR or CALENDARAUTO.
Inspect Slicer Settings: Examine the settings on the slicer by selecting it and opening the "Format" pane. It must be correctly set to filter the intended range (e.g., "Between," "Before," or "After") and not restricted by other visual-level filters.
Examine DAX Measures and Filters: If you are using DAX measures or calculated columns in your visuals, the slicer filters must be respected. You can test this by temporarily displaying unfiltered data in a table visual to verify the slicer's effect.
Hiding Filters: Use the View > Filters pane to check for hidden filters at the report, page, or visual level since they might stop the slicers from working correctly. After checking, delete or edit the sure filter.
