I believe that would work if I then changed the formula of Data As Of Date to be Data As Of Date = [AsOfDate].
My concern is if I have other sheets that are relying on AsOfDate being in the other data format. Also with this new Master Item formula, when I select Data As Of Date using a filter on the sheet it shows AsOfDate in the selection bar at the top and not Data As Of Date.
Do you know why there would be a difference between formula working in the old version compared to the April 2018 version?
Sorry, not sure why that would happen or if it's specific to April 2018
I tried to replicate your example myself and it seems to work: is this what you're looking for?
The chart uses set analysis expressions involving "DtField", while "NewField" is a master dimension (Date(DtField, 'DD/MM/YYYY')).
I can filter a value in the NewField dimension and the chart is responsive. It also displays correctly on the selections bar.