Stacked column in 3D
 

I have 9 data rows and 3 columns representing the dates.
I insert a stacked column in 3D, it gives default min to max dates. But when
I fix the vertical column values to my dates (which ranges 40296 - 40320 with
2.0 major unit) it does not show stacking of 3rd column. I also change the
data to dates and cell format to dates. I can even send the file if someone
can help me plz.