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Calendar: Julian #183
Description
julian_year_month_day()
julian_year_month_weekday()Using:
https://github.com/r-lib/clock/blob/master/inst/include/date/julian.h
julian_year_month_day()
julian_year_month_weekday()Using:
https://github.com/r-lib/clock/blob/master/inst/include/date/julian.h
Activity
jonthegeek commentedon Mar 25, 2023
Are you open to PRs to implement these? It would be a learning effort for me (working with cpp) but one I've wanted to take on.
DavisVaughan commentedon Mar 31, 2023
Not quite yet, I may end up just doing this myself in the next clock release, but I also have a plan to clean up some of the clock internals and possibly change the internal format some, so i wouldn't want that to interfere with your pr. I appreciate it though!
bbolker commentedon Sep 1, 2023
I'm very interested in this, but it feels like there are a lot of potential complications.
Kerzhner, I. M. 1984. “Converting Dates from the Julian (Old Style) or French Republican (Revolutionary) Calendars to the Gregorian (New Style) Calendar.” Taxon 33 (3): 410–12. https://doi.org/10.2307/1220979.
PS the link to
julian.habove is broken ...DavisVaughan commentedon Sep 1, 2023
Here's an updated link, not sure about all the particular details you mentioned yet
https://github.com/HowardHinnant/date/blob/master/include/date/julian.h
bbolker commentedon Sep 1, 2023
Thanks. It looks like it simply implements the calendar and allows conversion - doesn't tell you anything about dates. https://howardhinnant.github.io/date/julian.html I suspect it won't handle the New Year's Day/Lady Day shift correctly ...
joeroe commentedon Sep 5, 2023
@bbolker The CRAN packages aion (for calendar dates) and era (for fractional years) support the Julian calendar, if it's any use.