Ciao Hans As far I understand it JS dates are "proleptic" Georgian dates, i.e. the Gregorian date system is applied retrospectively to periods that did not use the Gregorian system.
Since transition to Gregorian from Julian differed by country its a quite complex problem (mainly for social historians) to get accurate dates. It is less of a problem for astronomical dates. Its more that, for instance, the dates 3rd September 1752 to 13th September in Britain do NOT exist. JS extension dates that go into Julian scopes are flagged as "needing a partner" i.e. If you need exact Julian you need some kind of partner program suited to final purpose that can convert from proleptic Gregorian. I think your general point about bigger date range makes sense, but the absolute extended JS date range is still not astronomical? Best wishes TT On Saturday, 15 February 2020 13:04:36 UTC+1, HansWobbe wrote: > > If this is done, it could be an opportunity to also capture the value of > using https://en.wikipedia.org/wiki/Julian_day. > > Astronomers make extensive use of this and have even gone to the trouble > of setting standards like incorporating a '0' date to help with arithmetic > calculations that extend beyond https://en.wikipedia.org/wiki/Common_Era > > > On Saturday, February 15, 2020 at 4:45:35 AM UTC-5, PMario wrote: >> >> Hi >> >> There seems to be an extended date in the spec: >> https://tc39.es/ecma262/#sec-expanded-years >> > ... > > BUT TW doesn't know about it. So we would need a new field prefixed: > ext-date- > or something similar. > > -- 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/dab885c2-e174-42a2-8afd-f79bdc2f18eb%40googlegroups.com.
