Re: [libreoffice-users] Islamic Calendar Dates

> > > When LibreOffice converts Gregorian to/from Islamic Calendar dates,
> > > when does it assume that the new Islamic day begins:
> > > * Sunset;
> > > * Midnight;
> > > * Sunrise;
> > >
> > > When LibreOffice converts Gregorian to/from Islamic Calendar dates,
> > > when does it assume that the first of the Islamic month begins:
> > > * Sunset;
> > > * Midnight;
> > > * Sunrise;
> >
> > I'm completely ignorant in this area but find the questions
> > interesting. However, doesn't the second (on first principles) follow
> > from the first?

In Islam:
* The new day begins at sunset.
* The new month begins at sunrise, after the new moon has been sighted.

Judaism, is slightly more logical. Both the new day and new month begin 
at sunset.
The new month begins on the sunset of the day that the new moon was sighted.

By way of example.
Sunset is at 5:00 PM  on Thursday.
The New moon is sighted at 5:10 PM on Thursday.
In Islam, the first of the month starts at sunrise on Friday.
In Judaism, the first of the month starts at sunset on Friday.
(If you want to be technical, replace _Judaism_ with _Karaite Judaism_.)

When going through journals of pious Muslims, you will occasionally see 
dates like 30 Shaʿbān 12th hour immediately followed by 1 Ramaḍān 13th 
hour.The first through twelfth hour doesn't exist for 1 Ramadan.
This is why knowing what assumptions are made about the converted date 
are important.

> I'm completely ignorant too. A quick search leads to the further question: which islamic calendar?

As best as I can determine, LibO uses a theoretical calendar.

jonathon



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