Need formula help with automatic monthly column coloring based on flexible dates

[excellearning]

Dear Excel Friends,

I need help on a very flexible formula for monthly automatic column coloring based on a date.

For everyone's reference, I have attached the Excel workbook Test5.

Points to be noted:

Sheet 1 is the data sheet.
Sheet 2 shows as example how the data should look visually as of 1st of February 2013.

Based on the any particular set day of the month (irrespective of any month and of any year) in system date (G1) and the corresponding date from pre - set date ( B3-O3), the colors of the columns in the range from B3-O28 need be automatically filled every month with: No color (previous month), Green (current month) , Red (next month) and Yellow for the rest of the months till the end.

Kindly note: Sheet 2 is a visual output reference example of how the formula should work with reference to the month February 2013.

Hope my query is clear.

Thanks everyone.

EL