Sometime in the 7th century.

Muhammed had some seizures in which God took the opportunity to speak to him. Since the man was illiterate, he told others what God said to him and they wrote it down for him. An Arab man named Zayd ibn Thabit was given the task of compiling all of the written revelations into a book format sometime around 650 on the Christian calendar.

1) "The Qur’ān (Arabic: القرآن al-qur'ān, literally "the recitation"; also sometimes transliterated as Quran, Koran, or Al-Qur'an) is the central religious text of Islam. Muslims believe the Qur'an to be the book of divine guidance and direction for mankind and consider the text in its original Arabic to be the literal word of God, revealed to Muhammad over a period of twenty-three years and view the Qur'an as God's final revelation to humanity." "The Qur'anic verses were originally memorized by Muhammad's companions as Muhammad recited them, with some being written down by one or more companions on whatever was at hand, from stones to pieces of bark. In the Sunni tradition, the collection of the Qur'ān compilation took place under the Caliph Abu Bakr, this task being led by Zayd ibn Thabit Al-Ansari. "The manuscript on which the Quran was collected, remained with Abu Bakr till Allah took him unto Him, and then with 'Umar till Allah took him unto Him, and finally it remained with Hafsa bint Umar (Umar's daughter)."" "According to Islam, Muhammad received the Qur'an as a series of revelations from God through the angel Gabriel (see [Qur'an 10:37]), and is reported to have had mysterious seizures at the moments of inspiration. Welch, a scholar of Islamic studies, states in the Encyclopedia of Islam that he believes the graphic descriptions of Muhammad's condition at these moments may be regarded as genuine,seeing as he was severely disformed after these revelations. According to Welch, these seizures would have been seen as convincing evidence for the superhuman origin of Muhammad's inspirations by the people around him. " Source and further information: http://en.wikipedia.org/wiki/Qur%27an 2) "Muslims believe the Qur'an to be the book of divine guidance and direction for mankind and consider the text in its original Arabic to be the literal word of God, revealed to Muhammad through the angel Gabriel over a period of twenty-three years and view the Qur'an as God's final revelation to humanity" "The origin and development of the Qur'an begun with Muhammad's belief of divine revelations in 610 AD. The verses of the Qur'an were written down and memorized during his life and collected shortly after his death. During the caliphate of Uthman the Qur'an was standardized in 653 AD. Slight developments in dotting and other punctuation happened during the seventh and eighth centuries. Muslim and most western scholars hold this account to be true." Source and further information: http://en.wikipedia.org/wiki/Origin_and_development_of_the_Qur%27an

Narrations differ as to how many copies of the original‘Uthmanic manuscripts of the Qur'an were directly ordered and sent out by the Caliph ‘Uthman, but they range from four to seven. It seems certain from various Muslim historical sources that several were lost, through fire amongst other things. There are some copies that are attributed to ‘Uthman. However, it is to be added that there is a disagreement between the scholars whether they are truly ‘Uthmanic. Three are mentioned below: There is an early Qur'anic manuscript in Tashkent, Uzbekistan. It is a massive manuscript on vellum showing a well-formed Kufic script without diacritical marks and ornamentation. The parchment has become very brittle with age. This famous manuscript also known as the Samarqand manuscript is commonly attributed to Caliph ‘Uthman. It would appear that during its storage in St. Petersberg, a number of folios were separated from this manuscript and subsequently ended up under the hammer at Christie's. What remains in Tashkent is approximately one third of the Qur'an from which these massive folios originate. A folio from the manuscript in Tashkent was recently subjected to radiocarbon tests at Oxford, United Kingdom. Although the dates generated by this radiometric technique at either confidence level do not rule out the possibility that this manuscript was produced in ‘Uthman's time, palaeographic studies suggest an 8th century (2nd century hijra) date. Another early Qur'anic Manuscript is housed at the Al-Hussein mosque, Cairo, Egypt. This Qur'anic manuscript, written in large Arabic script, is perhaps the oldest of all the manuscripts, and is either `Uthmanic or an exact copy from the original with similarity to the Madinan script. The book, made from deerskin pages, stands a staggering 50 centimeters high. The third early Qur'anic manuscript is in the Topkapi Museum, Istanbul, Turkey. Some pictures of this manuscript can be seen here http://www.islamic-awareness.org/Quran/Text/Mss/topkapi.html Source http://www.islamic-awareness.org/Quran/Text/Mss/ .

the holy koran was written by allah our god

There are two main theories. Firstly, the traditional Muslim one.This says that the Koran was created by God in Heaven, long ago, possible before or shortly after the creation on the Universe. (13.7 billion years ago?) This theory further states that the Koran was revealed in many parts to Mohammed between AD610 and the Prophets death in AD632.After Mohammeds death the fragmentary records were gathered together by his successors and compiled into the Koran between AD645 & AD650. The alternative theory is that multiple authors wrote the Koran between the time of Mohammed and AD800.Some claim that the Koran in its modern form was written in Bagdad by unknown authors around AD800.