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Australia/Lord_Howe is the weirdest timezone

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Re: Australia/Lord_Howe is the weirdest timezone

#31
> America/Nuuk does daylight savings at -01:00 (yes, with a negative)

Somewhat related: Europe/Dublin has a negative DST offset. Irish DST runs through the European winter (i.e. the opposite of the other European timezones).

(More details here: https://github.com/golang/go/issues/56743#issuecomment-13157... )

Edit: To be clear: the quote is referring to a negative DST start, rather than a negative DST offset.

Re: Australia/Lord_Howe is the weirdest timezone

#32
A friend of mine has been visiting places with weird time related things going on, because it is interesting and takes you funny places.

He has been to Lord Howe. Now I know why. He has a user account on HN. I will ask him if he wants to make an appearance here...

Re: Australia/Lord_Howe is the weirdest timezone

#33

Nah, the weirdest time zone is Africa/Addis_Ababa, which nobody in Ethiopia follows. Instead the locals offset the time by 6 hours. So the AM cycle starts at dawn (i.e. 6am), and the PM cycle starts at dusk (i.e. 6pm). https://en.wikipedia.org/wiki/Time_in_Ethiopia

Sounds like it could be a candidate. Any system which can't be expressed in standard software is stranger than every system that can be.

[dead]

Re: Australia/Lord_Howe is the weirdest timezone

#34

Oddly was just reading something yesterday and it mentioned that in the UK there were years during the war where we had double DST for energy saving reasons. (although we went between 1 hour and 2 hours, so it was only really a change compared to the norm) https://www.atlasobscura.com/articles/the-extreme-daylight-s...

I don't really understand how that would save energy. Did people work 7am-3pm days or something?

Re: Australia/Lord_Howe is the weirdest timezone

#36

Nah, the weirdest time zone is Africa/Addis_Ababa, which nobody in Ethiopia follows. Instead the locals offset the time by 6 hours. So the AM cycle starts at dawn (i.e. 6am), and the PM cycle starts at dusk (i.e. 6pm). https://en.wikipedia.org/wiki/Time_in_Ethiopia

For country near equator that is not actually unreasonable system to define day cycle.

Re: Australia/Lord_Howe is the weirdest timezone

#37

Oddly was just reading something yesterday and it mentioned that in the UK there were years during the war where we had double DST for energy saving reasons. (although we went between 1 hour and 2 hours, so it was only really a change compared to the norm) https://www.atlasobscura.com/articles/the-extreme-daylight-s...

I don't really understand how that would save energy. Did people work 7am-3pm days or something?

It doesn't! That is why some countries want to leave one time for the whole year. When lots of power were used by lighting, it must have saved something...

Re: Australia/Lord_Howe is the weirdest timezone

#38

Oddly was just reading something yesterday and it mentioned that in the UK there were years during the war where we had double DST for energy saving reasons. (although we went between 1 hour and 2 hours, so it was only really a change compared to the norm) https://www.atlasobscura.com/articles/the-extreme-daylight-s...

I don't really understand how that would save energy. Did people work 7am-3pm days or something?

The idea behind DST is that it shifts working hours into daylight hours during the darker months. This would theoretically cut down on energy use for lighting during those hours.

Of course offices, factories and even schools still use artificial lighting even during daylight hours. And now the energy use of artificial lighting is much lower than back when everything used filament.

Re: Australia/Lord_Howe is the weirdest timezone

#40
Earlier this year I had to write a function to find the current local time given a US address. The naive way to do so would be via a static mapping of state to time zone but there are a few edge cases that preclude doing this; in the interest of cost and speed relative to this specific application I spent a few dollars on a CSV that maps every US ZIP code to UTC offset and whether DST is followed (among other data). pytz takes IANA timezone names so I ended up having to map offset and DST info manually to specific timezones. As it turns out the US has a fair number of weird edge cases for overseas territories and military bases that necessitated the use of things like "Etc" zones [1] that have funky semantics (because of Unix for some reason if Wikipedia is to be believed).

[1] https://en.wikipedia.org/wiki/Tz_database#Area

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