what day is the first day of the week
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, Sunday is the first work day of the week. According to the Hebrew calendar and traditional Christian calendars, Sunday is the first day of the week.[1] But according to the International Organization for Standardization ISO 8601, Sunday is the seventh day of the week.[2]
Sunday The international standard ISO 8601 for representation of dates and times, states that Sunday is the seventh and last day of the week.[5] This method of representing dates and times unambiguously was first published in 1988.
Wednesday Wednesday is sometimes informally referred to as "hump day" in North America, a reference to the fact that Wednesday is the middle day—or "hump"—of a typical work week.[4]
Sunday On 7 March 321, Constantine I, Rome's first Christian Emperor (see Constantine I and Christianity), decreed that Sunday would be observed as the Roman day of rest:[10]