If you convert each date aggregation to a calculated field and then drop them into a hierarchy, you can manipulate the format differently for each level of aggregation
HTH 18.1 attached
DateFormat.twbx 2.3 MB
Right click Month Dimension >> Default Properties >> Set Date Format to "dd mmmm yyyy"
This would address your specific requirement.
If this post assists in resolving the question, please mark it helpful or as the 'correct answer' if it resolves the question. This will help other users find the same answer/resolution. Thank you.