Conditional formatting for 30 days, 3 months, 6 months & 1 year

Hi,

As in the title I'm trying to use conditional formatting for different dates, for example, if a date is 30 days or less in the past, it's green, over 30 days but less than 3 months will be in orange, more than 3 months red and over 6 months dark red or something like that.

I've attached an example of what I'm working with...

Look forward to any replies and TIA...!