Well, you want to simply have ONE column with something like the following?
Jan 1
Jan 2
...
Dec 28
Dec 29
...
Or is it possible you can have one side for months and the next column for days?
This could be easier to increment...
If it doesn't have to follow these strict guidelines, you could try something out from the following links:
http://www.vertex42.com/ExcelTemplates/yearly-calendar.htmlor
http://www.fireandknowledge.org/archives/2008/06/05/auto-increment-dates-in-excel/NOTE that the second link states:
"This can be done for days, weeks, months, years, etc."
Hopefully this can help....
Best of luck if I didn't help you, please comment and I can try to see if I can figure something else out.
Bordeaux0113 :)