Perhaps those servers are running Windows, where the time is local time and the server doesn't want to spend the effort to do the conversion?

The spec predicted in 1996 that this would happen: "(Note that this may cause problems for MS-DOS and other systems that use local rather than Universal time.)"

Are you seriously suggesting Windows doesn't know the concept of UTC time? And secondly suggesting that fiddling with timezone offsets is an expensive conversion?

the system clock on windows is not UTC, it is local time. On Unix the clock is always UTC and is converted to local time for display purposes.

That is the same as Windows. Where are you getting your information?

No, there was a time when Windows stored local time -- also synced to BIOS clock. I don't think that's true anymore, though.

it remains true in windows 10, although it can be changed via some registry fudging.