When Islam appeared in the seventh century, there are several calendars in issue worldwide. Most of the solar system, some of which are lunar and lunisolar. They are not like 2010 or 2011 calendar calendar was created and implemented in different civilizations in the world. It is significant that they all have different start dates refers to age.
Inconsistencies between different calendar eventually became a dilemma for Muslim youth. Started coming hard to know constantly the various documents and correspondence dated mainly in the Islamic world increased rapidly.
In order to solve the problem and set aside speaks an effective system of appointments that are clearly marked Islamic holy months and holidays, 'Umar bin Al-Khattab the second caliph of Islam ordered the establishment of an Islamic lunar calendar. This happened in 638 AD. The number of months is twelve. Use of cycles of the moon to measure the time decided by the verses of the Quran in different.
Starting point for the famous modern Muslim calendar Muslim migration to the security of Medina to escape persecution in Mecca. The event itself occurred some 16 years earlier. So, for the purpose of the event, the name was decided as a Hijri Islamic calendar. The word is derived from the Arabic word for migration is known as the Hijra. So the date of the Islamic calendar days to go and serve to 16 July 622 AD in the Gregorian calendar. One month of Islamic lunar calendar begins with the fresh views of a crescent. The Gregorian calendar and the calendar ofIslam internationally approved both have the same 12 months.