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Inevitably, any arithmetic algorithm is imprecise, and results often differ by a day or two from observation or complex calculation.
==Behavior of Kuwaiti algorithm==
''Note: This was determined by inspection of the output of the software and is possibly wrong for dates that were not examined.''
*Common (non-leap) years have 354 days. Leap years have 355 days.
*Odd-numbered months of the year have 30 days. Even-numbered months have 29 days. Exception: the 12th month of a leap year has 30 days.
*Eleven of every thirty years are leap years. The leap years are the years which are congruent modulo 30 to any of these numbers: 2, 5, 7, 10, 13, 15, 18, 21, 24, 26. Thus, a 30-year cycle always lasts exactly (354&mult;30)+11 = 10631 days.
*Correlation with Gregorian calendar: the 1st of January 2000 (a Saturday) corresponds to the 25th of Ramadan 1420. (Ramadan is the ninth month of the Islamic lunar year.)
== External links ==
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