[[Microsoft]] uses the '''Kuwaiti algorithm''' to convert between dates in the Western standard [[Gregorian calendar]] and dates in the [[Islamic]]Hijri or [[Islamic calendar|Hijri]] [[calendar]]. There is no fixed correspondence defined in advance between the Gregorian [[solar calendar]] and the Islamic [[lunar calendar]], since the latter is defined by the visibility of the new moon by religious authorities and can therefore vary by a day or two, depending on the particular Islamic authority, weather conditions, and other variables. As an attempt to make conversions between the calendars somewhat predictable, this [[algorithm]] is based on statistical analysis of historical data from [[Kuwait]]. The algorithm is inexact due to the use of statistical analysis, and conversions using this algorithm can often be in error by a day or two.
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== External links ==
* [http://www.microsoft.com/globaldev/DrIntl/columns/002/default.mspx#Q3 Microsoft Informationinformation on Kuwaiti Algorithmalgorithm] (see bottom of page)
