If it won't accept 10/15 as the date, and won't take the 10/16, I don't know anything else to tell you other than to go into your settings and check the computer's date and time, and also the specific time zone that is listed in your system settings. Be sure the time zone itself says "mountain time."
Unfortunately TurboTax Support closed at 9 PM Pacific.
ADDENDUM:
Actually they are open another 4 minutes, if you are lucky, or maybe they'll stay a little later:
FAQ: What is the TurboTax phone number?
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
