I've been attempting to alternate two colors between the columns on my calender (ex., green-red-green-red-green-red-green, not including the first row containing the days of the week) and can't seem to get it right. Could anyone help me?
Thank you very much.

You want it as the S column one color, then the M column another color, and so on? or as a checkerboard?

Dawn's calendar
Checkerboard version

Kristine