When are business taxes for 2017 due? Saturday 9/15/2018 or Monday 9/17/2018. Thanks

I have an S Corp

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If it is on extension the last day to file is Monday 9/17/18  HOWEVER do NOT wait to the last minute when the system gets jammed up ... if you are late TT is not to blame. 

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Right. And TT Support will be closed on Saturday and Sunday.

Get your taxes done using TurboTax

This weekend too ?  With the extensions looming ?  

Get your taxes done using TurboTax

as far as I know.  @TTGabi  Can you confirm?