A question about launch

Hi, I’m making a kind of survey on each coin for which I need the time of the beginning of the blockchain (defacto the genesis block). ZCash states on his blog that the launch happened in the morning of 28th October 2016 which would correspond to the UTC timezone, but most of the team come from the USA, which is approximately 8 hours back so the launch would have happened in the night. Could anyone please specify when did the launch of ZCash take place (local time) and also where is the team (or the office as shown here https://z.cash/about.html) located?
Thanks for help.