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The most important tool is suncalc.org

Next, if you use Linux and probably Mac you can set your time zone that any program uses with with the TZ environment variable. That TZ variable takes the format “UTC-hh:mm:ss”. Essentially you are making your own time zone.

Now if you just want it to apply to one application (I did to mess with my system less), you can set up an alias in your bashrc. So: alias tmux='env TZ="UTC+5:02:23” tmux'

Next would be to use the api on suncalc.org to update your bashrc once a day.

If you want it to be system wide it’s even easier but who knows what that will fuck with.

Sounds like its based on solar positioning and "high noon" instead of the relative timezone.

They would be just a little bit off. Technically not every day is 24 hours a day in this system. Some days are longer, some days are shorter. Two effects cause that. Both relate to the Earth losing a day from revolving around the sun. The Earth actually rotates 366 times per orbital period, but we gain or lose a day from the orbit itself depending on if its in agreement with rotation or not. That extra or less a day gets distributed through the year, but not evenly. Two factors make it not even. One is the tilt of the earth. The other is that our orbit isn't perfectly circular so for part of the year we have a higher angular velocity.

Because some days are 5 or so seconds short of a full 24 hours, and they tend to be near each other, it starts to add up over time and you can get a phase shift of about an hour peak to trough.

https://img.gvid.tv/i/3sgaWn37.gif

Well because I like language to have a tight correlation with reality, yes. But I also do use solar time for things. Like I consider my day to have ended at 8pm solar time.