title: Conditional formatting for dates
body: <p>I'm trying to come up with a simple conditional format formula for highlighting cells that have a date that is greater than three months older than today's date.  It seems though that the "Date is before" option only gives a few options, none of them seem to allow what I'm looking for.  Is there a custom formula that could accomplish this?</p>
  
  <p>Edit:  attaching a snip of the column in question:</p>
  
  <p><img src="https://i.stack.imgur.com/qnErQ.png" alt="Picture"></p>