as well in the 20th century. This shift has been accompanied by a reduction in the total number of hours worked per week. The present-day concept of the "weekend" first arose in the industrial north of Britain in the early 19th century. A day off is a non-working day, not necessarily on weekends.

Some countries have adopted a six-day workweek and one-day weekend (6×1), which can be Friday only (in Djibouti, Iran, Somalia and Libya),