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The information on this website is valid as of 29 August 2015. Map boundariesīoundary representation is not necessarily authoritative.

Islamic and Jewish holidays begin the evening preceding the date shown unless stated otherwise.

Islamic dates and holidays are approximate, as they are determined by local lunar observation.

Because of lunar observation and differences in time zones, the observance of Islamic holidays and calendar dates may vary from region to region. 1438, 1 Muharram falls on 2 October 2016. For example, 1 Muharram, the first day of Islamic year 1437 (known in the West by the Latin term Anno Hegirae, or A.H.), fell on 14 October 2015 in A.H. Because 12 lunar months multiplied by 29.53 days equals 354.36 days, the Islamic calendar will always be approximately 11 days shorter than the Western (Gregorian) calendar. Each month starts when the lunar crescent is first seen after a new moon. The Islamic year contains 12 months, none of which can exceed 30 days. The Islamic calendar is based on the movement and observation of the moon. We have retained, however, the spellings used on the Rewards for Justice and FBI terrorism sites spellings there are designed for easy recognition or are used in legal documents and therefore do not always conform to these rules. In this system, the letters “u” and “a” are preferred over “o” and “e.” For example, the name of the al-Qa‘ida operative who was detained on 1 March 2003 is Khalid Shaykh Muhammad, not Khalid Sheikh Mohammed he was an associate of Usama Bin Ladin, not Osama Bin Laden. While there is no universally accepted transliteration of Arabic names and terms, this edition of the Counterterrorism Calendar adheres to a transliteration system that is generally used throughout the US Government.

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