A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data
Select H3:H1000 or however far down you want.
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 'not equal to' from the second drop down.
In the box next to it, enter the formula
=""
Click Format...
Activate the Fill tab.
Select red as fill color.
Click OK, then click OK again.
Repeat these steps, but with "greater than or equal to", with the formula
=EDATE(TODAY(), -24)
and orange as fill color.
Repeat them again, with "greater than or equal to", with the formula
=EDATE(TODAY(), -12)
and green as fill color.
Finally, repeat them with "equal to", with the formula
="Never"
and blue as fill color.