Muharram (Arabic: المحرّم) is the first month of the Islamic calendar. It is one of the four sacred months of the year.[1] Since the Islamic calendar is a lunar calendar, Muharram moves from year to year when compared with the Gregorian calendar.

Muharram is so called because it is unlawful to fight during this month, the word is derived from the word haraam, meaning "sinful". It is held to be the most sacred of all the months, excluding Ramadan. Some Muslims fast during these days. The tenth day of Muharram is the Day of Ashura, which to Shia Muslims is part of the Mourning of Muharram.

Some Muslims fast during this day, because it is recorded in the hadith[citation needed] that Musa (Moses) and his people obtained a victory over the Egyptian Pharaoh on the 10th day of Muharram; accordingly Islamic prophet Muhammad asked Muslims to fast on this day that is Ashura and on a day before that is 9th so that they are not similar to Jews (since, according to him, Jews used to fast for one day due to the same reason, and many practices recorded in the hadith are specifically performed to avoid any apparent similarity to those of contemporary neighbouring Jews and Christians). Many Muslims cook something sweet like sweet rice and distribute it throughout their family and circle of friends to eat when breaking their fast.

Fasting differs among the Muslim groupings; mainstream Shia Muslims stop eating and drinking during sunlight hours and do not eat until late afternoon. Sunni Muslims also fast during Muharram for the first ten days of Muharram, or just the tenth day, or on both the ninth and tenth days; the exact term depending on the individual. Shia Muslims do so to replicate the sufferings of Hussein ibn Ali on the Day of Ashura. Shia Muslims go further in their replication, including self-flagellation.
01 Muharram:
The Islamic New Year.
01 Muharram: Shi'a Muslims begin the Commemoration of Muharram which marks the anniversary of the Battle of Karbala.
 


01 Muharram: Indonesian Muslims celebrate Satu Suro, a day of meditation for some.
 02 Muharram: Death anniversary of Umar ibn al-Khattab, the second Sunni Caliph of the Rashidun Caliphate.
 02 Muharram: Hussein ibn Ali enters Karbala and establishes camp. Yazid's forces are present.
 07 Muharram: Access to water was banned to Husayn ibn Ali by Yazid's orders.
 10 Muharram: Referred to as the Day of Ashurah (lit. "the tenth") was the day on which Hussein ibn Ali was martyred in the Battle of Karbala. Shia Muslims spend the day in mourning, whilst the Sunni Muslims fast on this day commemorating the rescue of the people of Israel by Musa (Moses) from Pharaoh[4]
 15 Muharram: Birth of Muhammad Sirajuddin Naqshbandi in 1297 AH (1879-1880 AD)
 25 Muharram: Martyrdom of Zayn al-‘Ābidīn, fourth Shia Imam, day of Shahid (martyrdom: lit. "witness", as "martyr" is Greek for "witness") in 95 AH (714 AD).
 27 Muharram, Mesum was killed.[citation needed]
 28 Muharram: Death anniversary Urs of Ashraf Jahangir Semnani in 808 AH (1405 AD) a great Sufi saint in India.
 Death anniversary Urs of Baba Farid, a great Sufi saint in Pakistan for six days in Muharram.