Read unstructured data - Excel calendar format

Hi Anonymous ，

You can refer to the following link to process your unstructured data in Power Query.

Best way to structure Excel survey data for leveraging in Power BI?

Power BI - Transferring less structured data

Data Inconsistency excel files different structure - build a model
If possible, try to process it on the data source side first. For example, like the example in your screenshot, you can combine the data of December, day and weekday into one row as a date column just as below screenshot.

Combine date information in data source

Then do the data transformation in Power Query to get the desired result. I have created a sample file(see attachment), please check if it is the result you want.

Data transformation in Power Query Editor

Best Regards