Solved
trying to fill my 2015 taxes and e-file it, but the problem is that every time I press "transmit" to e-file the documents. it forward me to page asked my for a signature date and telling me that I can only enter signature between 01/01/2016 and 12/31/2016 while we are in 2017
TurboTax does not support e-filing of past-year returns. You have to print your 2015 tax return and file it by mail.
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