Before I attempt to answer your question, I wanted to tell you what a blessing it is to have you on MA. Thanks for helping newbies and oldies and those of us in between, in spite of what seems to be happening in your own sitch. I guess, technically I'm an "oldie" regarding MA but compared to those who founded MA after being on MB, I'm a 'tweener' (10 years in early January 2017).
I believe the MA 501(c)3 documents (US Internal Revenue Tax non-profit status) were submitted in Texas in the summer of 2010, which would be the Central Time Zone in the US.
I'm sure someone will confirm or correct me but in the meantime, HAPPY NEW YEAR!
P.S. Since MA has members from all around the world, technically the "MA" time zone could be based on the time from wherever the member is posting or reading. For me, when I read MA without logging in, there are 2 hours between my time zone and MA's posted times.