While not a three month calendar, you might want to check:
A calendar template
http://www.tushar-mehta.com/excel/te..._calendar.html
"Create a 12-months-on-one-page calendar or a one-month-per-page
calendar for any year between 1900 and 3000 with the starting day-of-
week set to any weekday.

All the work is done through formulas. There is no code."

Also, you may want to search the templates at office.microsoft.com.
For example, http://office.microsoft.com/en-us/results.aspx?
Scope=TC&Query=calendar

--
Regards,

Tushar Mehta
www.tushar-mehta.com
Excel, PowerPoint, and VBA add-ins, tutorials
Custom MS Office productivity solutions

In article .com,
says...
I have a Lotus 123 spreadsheet that brings up three calendars. I need
to convert it to EXCEL. All I do is enter the first date of the month
and the three months come up one under each other. I just used
formulas to create the dates in each field.

Could someone tell me a formular I could use in the cells to bring up
the appropriate days for each calendar.

I tried to just convert the spreadsheet and apparently there is some
problem with the formula.

Here is the 123 formula for the 1st day of the month of the first
calendar. I just added days to it to get the rest of the days of the
month.

@IF(H70,H7+1,@IF(@DATEINFO(@DATE($A7,$A8,1),3)=R$ 1,1,""))

I need a formula that will work with Excel.

Thanks for any help.