We don't actually have exact days for events beyond about 5000 years ago. So 280000 years is fine, and 1400 times better than what we have now. Except for that Usher guy, no one knows what day of the week the universe was created.
Presumably, you know where you live. Your local date of 1/10/2020 is good enough for you, even if you live near the date line. The date records what date it was when you experienced the actual event. Tiddlers may need milliseconds and UTC in order to coordinate synching, but we don't need that for most everything else in our lives. What we need is a light-weight, human readable format and kit for dealing with dates from about 600 BC to 3000 AD. On Saturday, February 15, 2020 at 10:56:35 AM UTC-8, PMario wrote: > > On Saturday, February 15, 2020 at 4:14:08 PM UTC+1, Mark S. wrote: >> >> I know I'm probably in the minority, but I think a simple, local-time, >> user-readable date format would be useful. Like 1815-06-18 >> > > hmmm, That would be good enough, if you assume, that everyone lives in a > similar time-zone as you do. But what if I live near the date-line > https://en.wikipedia.org/wiki/International_Date_Line > > IMO there needs to be a marker like UTC or GMT+01 or something similar. So > the rest of the world knows what to do. > > So ext-date-somedate 1815-06-18 (UTC) would be OK for me personally. But > that's only a date in the past of the human history. > > What if I want to express the past in "homo sapiens's history" ... I > thought js extended date with +-270 thousand years would be good. .... but > no: See this article in The Guardian > <https://www.theguardian.com/science/2017/jun/07/oldest-homo-sapiens-bones-ever-found-shake-foundations-of-the-human-story>. > > > > So we need something up to about 2 000 000 years ago. See the second chart > at: https://en.wikipedia.org/wiki/Homo#Names_and_taxonomy > eg: 1.2 Mya 1.2 million years ago. > > But I do want more: What's about the universe > <https://en.wikipedia.org/wiki/Universe>, the age of the earth > <https://en.wikipedia.org/wiki/Age_of_the_Earth>or how long does our sun > live? > > I found Year Symbols <https://en.wikipedia.org/wiki/Year#Symbols>, which > should allow us to solve the problem for really big numbers ;) Especially SI > prefix multipliers > <https://en.wikipedia.org/wiki/Year#SI_prefix_multipliershttps://en.wikipedia.org/wiki/Year%23SI_prefix_multipliers>. > > > > Abbreviations yr and ya > <https://en.wikipedia.org/wiki/Year#Abbreviations_yr_and_ya> may be an > option too. Since they contain a shortcut for years and years *ago*. > > So ext-date-tyranno may be 66 (mya) ... or 66 (Ma) ago. > > I think it should be easy to create a parser for an extended timeline that > could deal with all of those dates. > > - js-extended dates are defined in the specs. years must start with + or - > and have 6 digits. The rest is as known. > - SI prefixes are ka, Ma, Ga, Ta, Pa, Ea > - non-SI are kyr, myr, gyr for years and kya, mya, bya for years ago. > > So if ext-date-my-date-1 would be 1.2 (bya) it should be easy to know, > what I want to say. > > have fun! > mario > > -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/3417d113-f72c-4bb6-8f0b-3a6e37ccbd4f%40googlegroups.com.
