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I'm trying to add a line to a set of existing validation rules so they only apply to opportunities created prior to a fixed date. Let's say 10/31/2018. I thought it would be pretty straightforward as

CreatedDate < 10/31/2018

So the entire rule would read:

ISPICKVAL ( StageName, "Demo")&&

Clinical_Buyer__c = FALSE&&

CreatedDate < 10/31/2018

I keep getting the error that the '<' was expecting a DateTime received Number.

Unlike SOQL, formulas don't accept date literals. You'll need to construct your Date values using either the DATE() function :

The DATE() function returns a Date value, given a year, month, and day. Numerical Y/M/D values and the YEAR(), MONTH(), and DAY() functions are valid parameters for DATE(). For example DATE( 2013, 6, 1 ) returns June 1, 2013

or the DATEVALUE() function, with a text parameter in ISO format:

You can also convert text to a Date so you can use the string value with your other Date fields and formulas. You’ll want your text to be formatted as “YYYY-MM-DD”. Use this formula to return the Date value:

DATEVALUE( "YYYY-MM-DD" )

If you want to compare the DateTime CreatedDate to a Date value, you can convert the field value with DATEVALUE():

DATEVALUE(CreatedDate) < DATEVALUE("2018-10-31")