A couple weeks ago I had an online meeting with some European colleagues; I showed up in the chat room at what I thought was the agreed-upon time and they did not, which was odd, but whatever, I waited ten minutes and then rescheduled the meeting. It turns out they did the same an hour later. I’m sure you can guess why.
If you have been sent a link to this page, it is to remind you that “Eastern Standard Time” is not defined as “whatever time it is in New York City right now”, it is defined as “Eastern Time not adjusted for Daylight Saving Time“. Parts of the world in the eastern time zone that do not observe Daylight Saving Time — Panama, for instance — stay in Eastern Standard Time all year, so it is an error to assume that Eastern Standard Time and Eastern Time are the same time.