thanks, that helps me. It was not checked initially, but when I try "Disable->for an hour" it shows me a hidden check-box "Disable->for iphoneSimulator". When I uncheck both - all works as expected.

🤩 🥳

Assuming you're in the same place at night, I would just dial back the f.lux settings until things look good.

FWIW: personally I do not enable True Tone because I think it is too warm during the day.

Also, I can't find a place to post forum bugs but when I went to enable email notifications it wouldn't let me save due to pagination settings that I assume were the defaults as I did not set them: https://i.ibb.co/KhYBKWF/Screen-Shot-2021-11-09-at-18-14-50.png

Hmm, looks like they are 5 hours behind (or really, 19 hours ahead). But you are right, the language settings should have no impact on local time. I will email for some more debugging.

Thanks - mine is macOS 11.5.2 with Chrome 93, so slightly different, so maybe the Chrome 94 beta is changing some things?

Not exactly related but suggests something is changing:

https://www.reddit.com/r/chrome/comments/ocxicd/new_chrome_update_has_a_bug_with_youtube/

Which version of macOS is this?

We do all our internals in GMT/UTC so if the sum of time zone and wall-clock time is correct, it should keep working.

Here is a tester script to compare with our server:
https://justgetflux.com/timesync.html

So yes, if "UTC time" in the OS is wrong, we will transition at the wrong time.

We only use tz changes as a cue to adjust location (like for traveling between timezones), but cancelling this dialog is just fine too.

We don't know of any updates in High Sierra that should affect this - did you add any hardware/external displays or anything like that.

Usually this means you need to set your location from the f.lux preferences menu.

I believe Linux has the same problem. I don't know if f.lux has a Linux version or not, but I use a similar program called redshift, and it has this mouse pointer issue. The little bit of research I did indicated that it is a very difficult problem to fix, so I just live with it. A minor annoyance.