Ramadan (/ˌræməˈdɑːn/; Arabic: Ramaḍān, IPA: [ramaˈdˤaːn];[note 1] also romanized as Ramazan, Ramadhan, or Ramathan) is the ninth month of the Islamic calendar,and is observed by Muslims worldwide as a month of fasting (Sawm) to commemorate the first revelation of the Quran to Muhammad according to Islamic belief. This annual observance is regarded as one of the Five Pillars of Islam. The month lasts 29–30 days based on the visual sightings of the crescent moon, according to numerous biographical accounts compiled in the hadiths.
Youth Day is a holiday dedicated to the youths of a country. It is observed by 18 countries, on many different dates throughout the year. The United Nations agreed on the date of 12 August in 1999. In Iran the youth day is celebrated on the birthday anniversary of Ali Akbar the eldest son of Imam Hossein who was martyred in Karbala.