When entering the date of the payment made with my 2018 extension, Turbotax won't accept it because after 1/1/18. Any suggestions?

You could not even request an extension for 2018 until late March of 2019.  So when did you make a payment for your 2018 extension?

I obviously meant 1/1/19... but thanks for calling me out on my error, instead of answering my question.  I figured it out.

How did you correct this?  I think I might have made a similar error and I am struggling to figure out where to update the date.

Be sure of you are using the 2019 program you use a 2019 date

@cwatkin

enter any date that works.

If you made a  payment with request or sent a check marked 'for year <20nn> extension", you will be credited.