Pivot table date format

Hoping for some help.

I have data that I wish to use in a pivot table. The date on the data it 12/03/26 e.g but if showing in the cell as wed, 12/03/26 which is what I need as the day of the week is important when veiwing the data in the pivot chart. However, when putting the column of data into the pivot chart it is showing as 12-March. I cannot seem to find a way to make it appear as it does in the formatted original column. Easy one?

Dates for example and may not make calender sense :)