Midnight tonight in YOUR time zone is the cutoff. If you have not e-filed an original 2022 return by then, you will need to use the CD/download on a full PC or Mac to finish preparing your return and it will have to be filed by mail. If you e-file by the deadline and the return is rejected by the IRS you get a few extra days to fix the mistakes and re-file via e-file.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**