I am using an AutoFilter with VBA in Excel that works for regular filters, but not a column formatted as date.
I can filter it manually. If I run my code, it filters
here's the occam's razor solution... try putting this in Autoopen for the spreadsheet or if you need to, modify it for the sheet that you wish to affect. it will cause the drop down filters for the date headers to appear as individual dates and not as a date hierarchy.
ActiveWindow.AutoFilterDateGrouping = False