On Sun, May 26, 2013 at 07:55:55PM +0100, Sami Kerola wrote: > On 26 May 2013 19:23, Bernhard Voelker <mail@xxxxxxxxxxxxxxxxxxx> wrote: > > On 05/26/2013 11:14 AM, Sami Kerola wrote: > >> The cal branch I have in my git has got fixes to issues reviewed earlier, > >> and I hope all works. Based on that I decided to get rid of upper cal > >> year limit, 9999, and replace it with unsigned long. I know the change > >> does not make much practical sense, the point of the change is that where > >> there is no need to have artificial limits to a random magic number they > >> should not exist. > > > > unsigned years ... hmm, not that this would work today, but what about BC > > years? E.g. on what weekday did Julius Caesar die (March 15th, 44 BC, [1])? > > Maybe a future improvement (... having to make years signed again)? > > > > [1] http://en.wikipedia.org/wiki/Julius_Caesar > > Hi Berny, > > You are right. I'll make the year to be signed, and make error to be > displayed, for now, if negative year is defined. > > BTW I tried the Tøndering's algorithm negative years and it gave odd > and obviously wrong results. If someone who is part of this list is > interested of mathematical puzzles making the negative year weekday > determination to work should be interesting challenge. If I good remember from "my previous life" than for example PostgreSQL uses Julian calendar for unlimited datetime calculations. See https://github.com/postgres/postgres/blob/master/src/backend/utils/adt/datetime.c and date2j(), j2date() and j2day() functions. Anyway, I have no clue if the calculations are correct (in regards to reformation 1752). Karel -- Karel Zak <kzak@xxxxxxxxxx> http://karelzak.blogspot.com -- To unsubscribe from this list: send the line "unsubscribe util-linux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
