Which Islamic calendar is commonly used?

[Fusion Future]

On 1/12/23 20:23, ali moeini wrote:
> As for Iran, the religious calender is based on the sighting of the 
> moon by eye.
> So for important months, the religious leaders would go on roof of 
> their house or some place high and try to see the moon. If it is seen 
> the new month begins.
> I'm no professional and do not know much about how exactly it works, 
> and I also know only the way Iran's version of Islam calculates it. 
> But I have heard that this is also used in political means
> For example other Arabic countries announced the new month for ending 
> the fasting period but Iranian goverment announced it a day later and 
> threatend any Iranian Islamic leaders to not say otherwise.
> So it is a difficult thing and I guess it has little to do with 
> calculation. Sorry beforehand if my knowledge is flawed.

There is already "The Solar Hijri Calendar" in Plasma 5.26, which may 
help you. Do you mean the calendar will need to support date offset like 
other Islamic calendars?