What is the time--- of the deadline for online for filing after an extension? PST or EST? i am in the Pacific NW is for me is it PST? i dont want it to cut out on me.

This is what we were told by TurboTax:

"October 16, 2017 at 11:59:59 PM local time to the customer- The final deadline to E-file your return for this tax year and be considered “on time” (assuming you filed an extension)."

If it rejects you have until oct 21 to fix and resubmit.

thank you so much. But then do you have to mail it in? One year it would not accept online and said online was closed. and it was hard then finding all the forms.

If you efile before the deadline tonight, and it were to reject tonight or tomorrow or so, you have another few days to correct it and either efile it again, or to switch to filing by mail.   Online TurboTax will not shut down for you if you efile it tonight.

According to TurboTax, for a rejected return:

October 22, 2017 at 3 AM PST- Last day to fix rejected returns and not incur additional penalties or interest (again assuming an extension was filed and accepted)

Note that that is barely into October 22.   TurboTax is sometimes saying "October 21" to be sure people don't think they can efile during the daytime of October 22.