HijriAdjustment setting

This parameter is used only if the CalendarName setting is defined to 'Hijri'. It allows to adjust the calendar according to whether one wishes to rely on the astronomical calendar or the civil calendar. Another use case is to adjust the calendar to some offical dates determinated by observation.

The Islamic calendar months alternately have 30 and 29 days leading to a year of 354 days. To maintain calendar synchronized with the lunar phases, every two or three years an extra day is added to the last month, resulting in a calendar year of 355 days. There are four types of calendars, numbered I to IV, each of them use a slightly different intercalary schemes. This explains some slight differences between each calendar according to the used leap years. Each scheme has two variants depending on whether the time of the Islamic calendar begins on July 15, 622 CE (astronomical calendar) or July 16, 622 CE (civil calendar).

Two special dates, the first day of Ramadan and the first day of Chawwal (ninth and tenth month) normaly should not be calculated because they are determined by observation of the first Crescent Moon according to the Quran. This observation is then reported to a judge, and if it is agreed, communicates this announcement to the interpreter of Islamic law, the Mufti. This visibility can vary depending on weather factors or location of the observer. Of all some Muslims rely on a local point of view. Others, instead, rely on the point of view of the competent authority in the Islamic world. However, the calculation may be accepted in certain circumstances.

The European Council for Fatwa and Research has studied the question of the day of the beginning of the fast and its failure in the year 1421. The Board reiterates its decision was issued to the third session held in Cologne (Germany) from 19 to 22 May 1999:

The beginning of Ramadan or end are determined by Visual means, either to the naked eye or by an instrument of observation. This observation is admissible regardless of the Muslim country where she reportedly took place according to the authentic Hadith which says: 'fast as soon as you can see the Moon (of Ramadan) and break as soon as you can see the Moon (of Chawal announces the end of Ramadan)', provided that the astronomical calculations tell us that vision is possible somewhere on the globe. If no observation of the new moon is possible according to the calculations, any assertion of vision will be considered inadmissible. Ocular testimony is not certain, it may be the result of illusion, mistake or deception. It remains speculative order, contrary to the astronomical calculations are affirmative. The speculative cannot match the affirmative and even less the counter, and the unanimous opinion of Ulemas.

This skin object use internal algorithms from the framework .Net. Microsoft have choosen to use the Kuwaiti algorithm for his products. It is a type 1 algorithm (astronomical calendar) based on July 15, 622 CE. To display dates consistent with a civil calendar, define the setting HijriAdjustment to -1.


<tm:CURRENTDATEEXT runat="server" ID="tmCURRENTDATEEXT" CalendarName="Hijri" CultureName="ar-MA" HijriAdjustment="-1" DateFormat="D" />

Last edited Nov 8, 2010 at 6:14 PM by ploum, version 1


kiraqi Nov 9, 2010 at 1:53 PM 
very interesting, oh yes it really true what is said
wonderful space :)