Hover the timestamp here on HN and you'll see it at least once in your life time :) I'm guessing it's mostly developers, especially ones working internationally, who come across it every day. Others seem to prefer to convert between people's timezone, while we just send UTC+00:00 to each other.
I was about to comment that it's not UTC, it's in my local time. Then I remembered my local time (Europe/London) is currently equivalent to UTC, so I have no idea what it's actually displaying (it's not indicated in any way).
It's actually a problem in these parts that it's not obvious to us whether a time is in UTC or local time. I've found so many things displayed in UTC that people have assumed is local time then summer comes around and everything is off by an hour.
Hover the timestamp here on HN and you'll see it at least once in your life time :) I'm guessing it's mostly developers, especially ones working internationally, who come across it every day. Others seem to prefer to convert between people's timezone, while we just send UTC+00:00 to each other.