Global Islamic (Hijri) Calendar
Global islamic calendar is a suggested, unified hijri calendar that should be adopted by every muslim in the world. It is based on the premise that muslims are one ummah, one community with one God, one religion, and therefore one calendar system. The global islamic calendar was developed with one principle that one day is represented by one date. This ensures that everyone starts the islamic date on the same day anywhere in the world.
See current islamic calendars and important dates based on Global Rukyatul Hilal system:
You may also download the calendar from the pages linked above. If available, the PDFs of the calendar can be downloaded or printed.
Available Global islamic calendars
1940, 1941, 1942, 1943, 1944, 1945, 1946, 1947, 1948, 1949, 1950, 1951, 1952, 1953, 1954, 1955, 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026, 2027, 2028, 2029, 2030, 2031, 2032, 2033, 2034, 2035, 2036, 2037, 2038, 2039, 2040, 2041, 2042, 2043, 2044, 2045, 2046, 2047, 2048, 2049, 2050, 2051, 2052, 2053, 2054, 2055, 2056, 2057, 2058, 2059, 2060, 2061, 2062, 2063, 2064, 2065, 2066, 2067, 2068, 2069, 2070, 2071, 2072, 2073, 2074, 2075, 2076, 2077, 2078, 2079, 2080, 2081, 2082, 2083, 2084, 2085, 2086, 2087, 2088, 2089, 2090, 2091, 2092, 2093, 2094, 2095, 2096, 2097, 2098, 2099, 2100, 2101, 2102, 2103, 2104, 2105, 2106, 2107, 2108, 2109, 2110, 2111, 2112, 2113, 2114, 2115, 2116, 2117, 2118, 2119, 2120, 2121, 2122, 2123, 2124, 2125, 2126, 2127, 2128, 2129, 2130,
How Is Global Islamic Calendar Calculated?
Islamic calendar, in general, follows the synodical period of the moon circling the earth. A month in the islamic calendar correlate with one synodic cycle of the moon which in average lasts for 29.5 days. As a results, one lunar month of the islamic calendar will have either 29 or 30 days depending on the length of a particular synodic cycle of the moon.
Traditionally, the beginning of the islamic month is marked by sighting the first visible crescent moon, physically, using naked eye. The global islamic calender is calculated based on global crescent moon sighting probability in the beginning of each islamic months. It is based on the general direction given by the Prophet Muhammad (peace be upon him) to begin and end islamic months by sighting the crescent moon (hilal). Since the direction was addressed to the whole ummah, then a sighting of the crescent moon in one location, any where on earth, within one particular day, is sufficient to start the new islamic month.
Following this general direction is the only way in formulating a global islamic calendar that can unite the whole muslim populations around the world. Following local moonsighting, on the other hand, will never unite the whole muslim ummah, since there will always be regions where the crescent moon will not be visible on the day it will be visible in other regions.
Technically, the global sighting probability of the crescent moon on particular day is calculated based on the works by scientists and astronomers that studied and collected reliable crescent moon sighting reports from around the world, such as Yallop (1997) and Odeh (2006). The calculations can be visualised as crescent moon visibility maps that show which regions or countries on earth that can see the new crescent moon on particular evening (such as those displayed above). The HilalMap service in this website is dedicated in generating and displaying such crescent moon visibility maps that are useful in determining the beginning of islamic months.
The global islamic calendar dates displayed in this website is based on the following simple rule:
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If after sunset on a particular day (CE date) the crescent moon is calculated to be visible from any where between the west coast lines of the American continents and the International Date Line (IDL), then the next day is the first day of the islamic calendar.
This rule ensures that the calculated beginnings of the islamic month is always accompanied by positive hilal or crescent moon sighting reports from some muslims around the world on the preceding evening of the respective months.
