Friday is the day of the week falling between Thursday and Saturday. It is the sixth day in countries that adopt a Sunday-first convention. In ISO 8601, in work-based customs, and in countries adopting Monday-first conventions, it is the fifth day of the week.
In most countries with a five-day work week, Friday is the last workday before the weekend and is, therefore, viewed as a cause for celebration or relief (leading to the phrase "TGIF", for "Thank God It's Friday"). In recent years, in some offices, employees are allowed to wear less formal attire on Fridays, known as Casual Friday or Dress-Down Friday.
In Saudi Arabia and Iran, however, Friday is the last day of the weekend and Saturday is the first workday. Moreover, in some countries, Friday is the first day of the weekend, and Sunday is the first workday. In Bahrain, the United Arab Emirates (U.A.E.) and Kuwait, Friday was formerly the last day of the weekend while Saturday was the first workday. However, this was changed in Bahrain and the U.A.E. on 1 September 2006 to Friday as the first day of the weekend and Sunday as the beginning of the workday, with Kuwait following on 1 September 2007.