A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Select B3:B100 or however far down the data go.
On the Home tab of the ribbon, click Conditional Formatting > New Rule...
Select 'Format only cells that contain'.
Leave the first drop down set to 'Cell Value'.
Select 'greater than' from the second drop down.
In the box next to it, enter the formula
=EDATE(TODAY(), 6)
Click Format...
Activate the Fill tab.
Select green as fill color.
Click OK, then click OK again.
Repeat, but with 'less than or equal to' and
=EDATE(TODAY(), 3)
and orange as fill color.
Finally, repeat with 'less than' and
=TODAY()
and red as fill color.
Remark: cells with dates between 3 and 6 months from today will not be colored.