when does the week begin sunday or monday
Sunday For most observant Christians, Sunday is observed as a day of worship and rest, holding it as the Lord's Day and the day of Christ's resurrection. In some Muslim countries and Israel,[citation needed] Sunday is the first work day of the week. According to the Hebrew calendars and traditional Christian calendars, Sunday is the first day of the week.[1] According to the International Organization for Standardization ISO 8601, Sunday is the seventh day of the week.[2]