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At least they specified the timezone, and at least they got the timezone correct (PDT, and not PST) [1].

[1] Not only do a lot of communications not specify a timezone at all, but some communications specify a timezone incorrectly. I recently submitted a ticket with Apple dev support, and the automated reply specifies their hours of operation as 7am to 5pm PST. They're probably clueless, and they mean PDT, but if someone takes them at their word, those hours of operation are off by an hour.

If the outage happened in two time zones, which time zone should they use to report? The priority is to make the write-up clear, which means picking a single time zone and being consistent. I guess you could argue it should be UTC, but practically it makes no difference.

I guess you could argue it should be UTC, but practically it makes no difference.

Everybody knows, or should know, their time zone's delta to UTC. I'm sure there are lots of people who don't know their delta to PDT.

The majority of the AWS team lives and works here in downtown Seattle, so all of the times are in PDT.

It says that the company is headquartered in Seattle, Washington which is on Pacific Daylight Time.