Comment 0 for bug 153150

I want to autofill a series of dates, but in merged cells. I need to have a header row that is composed of 4 merge cells that states dates incrementally:
E.G. :

--------------------------------------------
                         |------------------
Date |------------------
                         |------------------
--------------------------------------------
I want to |------------------
autofill |------------------
increments here |------------------
---------------------------------------------

right now when I use the autofil feature, the increments are 4 instead of what I would expect to be 1 (because there are now 1 merged cell and not 4 separate cells). I tried to use the fill series function, but it fools the spreadsheet and fills each row, as if the cells were not merged.

Is there a way to accomplish this without having to enter each date manually ?

Thank you for your time,

David.