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POLosing a day when converting a Gregorian date to Um al Qura
 

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  1. POLosing a day when converting a Gregorian date to Um al Qura
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    <p>I am having an issue when getting the day, month and year components of a C# DateTime object using the Um al Qura calendar.</p> <p>The snippet of code is:</p> <pre><code>DateTime date = new DateTime(2013, 6, 24); UmAlQuraCalendar umAlQuraCalendar = new UmAlQuraCalendar(); int year = umAlQuraCalendar.GetYear(date); int month = umAlQuraCalendar.GetMonth(date); int day = umAlQuraCalendar.GetDayOfMonth(date); </code></pre> <p>After running this, year is 1434 and month is 8, which are both correct. However, day is 14 which is wrong (according to here: <a href="http://www.al-habib.info/islamic-calendar/islamic-calendar-ummulqura-2013.htm" rel="nofollow">http://www.al-habib.info/islamic-calendar/islamic-calendar-ummulqura-2013.htm</a>)</p> <p>If I change the code to:</p> <pre><code>DateTime date = new DateTime(2013, 6, 24, 0, 0, 0, 1); // i.e. One millisecond after midnight UmAlQuraCalendar umAlQuraCalendar = new UmAlQuraCalendar(); int year = umAlQuraCalendar.GetYear(date); int month = umAlQuraCalendar.GetMonth(date); int day = umAlQuraCalendar.GetDayOfMonth(date); </code></pre> <p>Then day is 15, which is correct.</p> <p>To make matters weirder, this code is in the depths of a large application: the C# code is called from a VB6 exe.</p> <p>If I extract the first snippet above to a standalone C# project (.NET 2.0), then day is 15, which is correct.</p> <p>I've checked everything I can think of that might be different between the two projects: .NET version, Platform target (x86), but can't see anything obvious.</p> <p>Any thoughts greatly appreciated.</p>
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    1. COAlways you can adjust the hijri calendar as the calculations sometimes are not accurate, when the computer says tomorrow isn't the 1st of Ramadan and people see the moon at the end of the day then the calculations will change to synchronize the actual calendar, the hijri calendar wasn't supposed to be calculated by equations, it is calculated by the appearance of the moon. in the control panel in the regional and language settings if you choose the hijri calendar you can set the adjustment of the hijri day
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      1. POLosing a day when converting a Gregorian date to Um al Qura
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    2. COYes, that's my understanding of the Hijri calendar, but I'm using the Um al Qura calendar (http://msdn.microsoft.com/en-us/library/system.globalization.umalquracalendar(v=vs.80).aspx), which doesn't have an adjustment factor.
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