Does the irs accept the date the return is transmitted as the filing date?

[comical60]

what happens if the irs rejects my submission

[Critter-3]

If you file today and it is rejected you have 5 days to "perfect" the return and resubmit it   OR    mail it in with the rejection notice to be considered timely filed.  

[fanfare]

if your return is REJECTED for AGI mismatch and you don't have a self-selected PIN from 2018, it will never be ACCEPTED.

try AGI = zero, after that you'll have to file by US Mail.

[VolvoGirl]

Here's Turbo Tax Calendar

https://ttlc.intuit.com/community/tax-planning-and-deadlines/help/tax-year-calendar-important-dates-...