Daryl Manning <da...@wakatara.com> writes: > I'd just be excited to have us run through the basic use cases and then see > some more "tricky" ones. I imagine there are things we'd just have to > say... too tricky for (eg. flight takes off in one TZ and range allows it > to land in timezone... stuff like that might be tricky.).
https://www.youtube.com/watch?v=-5wpm-gesOY gives various examples. To summarize: 1. Time (YYYY-MM-DD HH:MM) not continuous and may change arbitrarily at certain times a year or in future or in the past: - DST transitions are not stable and change from year to year according to strange rules that may involve Julian dates or counting weekdays - DST transition rules may change over time - The new year day itself is not necessarily fixed (England - Julian/Gregorian transitions happened at different times in different countries 2. There might be arbitrary time gaps due to time transition, including time overlaps with the same time of the day happening multiple time a day: - One hour back during DST transition (northern and southern hemispheres do the transitions in opposite directions) - Multiple days skipped (Samoa skips a whole day during DST transition) - Great Britain used 2 hours DST offset during WWII - Julian/Gregorian calendar transitions in the past 3. We cannot assume that the same geographical area has fixed time zone even at given point of time: - Palestinian/Israeli people follow different time zones in the contested territories 4. Great Britain had new year on March 25 until 16th century (March 24, 1000 -> (+1 day) March 25, 1001) 5. Leap seconds! 23:59:59 -> 23:59:60 -> 00:00:00, according to astronomical Earth observations > So, is the TS syntax you've described accepted and canonical now with > org-mode? We are still discussing it. -- Ihor Radchenko // yantar92, Org mode contributor, Learn more about Org mode at <https://orgmode.org/>. Support Org development at <https://liberapay.com/org-mode>, or support my work at <https://liberapay.com/yantar92>