Nathan,
You are welcome to test it by comparing it to some old code which can
still be found on the web which I wrote in 2004 and uses
java.util.Calendar to calculate JD.
"Listing 1 is FAQCalendar which subclasses java.util.Gregoriancalendar
and provides methods to calculate:
# Day numbers -- getJulianDay(), getUnixDay()-- which you can use to
calculate the difference in calendar days.
# The difference in day periods and in the temptingly "trivial to
calculate" 24-hour periods --
diffDayPeriods( Calendar), get24HourPeriods(Calendar)."
-- http://www.xmission.com/~goodhill/dates/deltaDates.html
Note this code assumes JD is the same from midnight to midnight, the
chronologist, historians, or calenderists JD, not the astronomers JD
which runs from noon to noon.
-Paul
Stephen Colebourne wrote:
> I would be happy to accept a patch adding fromModifiedJulianDays(long)
> and toModifiedJulianDays() to LocalDate.
>
> Stephen
>
>
> 2009/5/4 Nathaniel S. Parsons <ns...@cornell.edu>:
>
>>Is Joda Time interested in having this support? I've found a number of
>>options online, and could code them up in Java along with some unit tests
>>(and having other eyes to look at them would be helpful).
>>
>>-Nate
>>
>>On Sun, May 3, 2009 at 10:29 AM, Stephen Colebourne <scolebou...@joda.org>
>>wrote:
>>
>>>Joda-Time doesn't have any support for converting MJD/JD
>>>unfortunately, so you have to do it yourself.
>>>
>>>Stephen
>>>
>>>
>>>2009/5/3 Nathaniel S. Parsons <ns...@cornell.edu>:
>>>
>>>>Hi,
>>>>
>>>>Sorry if my question comes from a misunderstanding of time or not
>>>>reading
>>>>the documentation, but this has been bothering me for a while. I'm
>>>>trying
>>>>to convert an existing app to use Joda time. Currently, it uses a ad-hoc
>>>>mix
>>>>of Julian Date and Modified Julian Date, stored as a single double (days
>>>>since January 1, 4713 BC Greenwich noon or JD - 2400000.5). Is there a
>>>>simple way to convert this to a DateTime/Instant? What chronology should
>>>>I
>>>>use?
>>>>
>>>>I'm not really interested in historical accuracy, just calculations for
>>>>today and the next few months/years.
>>>>
>>>>Thanks,
>>>>Nate
>>>>
>>>>
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