I want to have excel automatically number columns starting with a number that
is entered into a cell. I am using the columns to represent a calendar
month. So for example, the number entered into the cell is 100 and then from
the first day of the month until the end each column would display from
number 1 thru 30. Then the next month on the next sheet would show another
month and start with the number 31.

I also would like to be able to fill in two different colors based on
specific days of each month.