Always, always, decide on a time zone that matches the clock above the CEOs desk at the company buying the service.

You're selling boats? Customer's wall clock. You're talking with azure support because your bill has some bloated charges? You better believe your clock is the only one that counts. The highest ranking person in the entity forking over cash has control over time zones and fuck everyone else.

The next time I ask Siri anything, she better just tell me the time in Atlanta even if I ask for anything else.