Comment by ButlerianJihad

When I started at a large company in 2020, I began to notice that they advertised all times: meetings, deadlines, events, in terms of "EST". Even when it was Daylight Savings Time.

So, being in Arizona where it's never DST, I called them out on it, and I continually bothered them when they used this "EST" notation. I told them that they were simply wrong to use it during Daylight Savings Time. I told them that MST and Eastern Time did not have a year-round relationship. They didn't care.

It turns out that a lot of very large corporations use "EST" (and other "standard time" notation) all year round. Including FedEx and UPS, for some reason.

It is obviously ridiculous, when you could simply use "ET" instead, and always be right, no matter what your DST status is. But they insisted on using this "EST" thing.

I had a conversation or two with some LLMs about it, and they rationalized it. But it is crazy to subject people to this "corporate fiction" that is obviously wrong/inaccurate for an entire half of the year, and it leads to a lot of problems.