Week is a time unit equal to seven days.

Week is the standard time period used for cycles of rest days in most parts of the world, mostly alongside—although not strictly part of—the Gregorian calendar.

ISO 8601 includes the ISO Week date system, a numbering system for Weeks within a given year – each Week begins on a Monday and is associated with the year that contains that week's Thursday (so that if a year starts in a long weekend Friday–Sunday, Week number one of the year will start after that). ISO 8601 assigns numbers to the days of the Week, running from 1 to 7 for Monday through to Sunday.

Week is technically, except at Daylight Saving Time transitions or leap seconds,

1 Week = 7 days = 168 hours = 10,080 minutes = 604,800 seconds

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