WEEKNUM
Returns the ISO week number of a given date.
Syntax:
WEEKNUM(date, mode)
returns the international standard ISO8601 week number, where week 1 is the week that contains January 4th. date is the date as a date-time serial number or as text. mode specifies which day is considered the first day of the week: 1 for Sunday, 2 for Monday.
Example:
WEEKNUM("2010-01-07", 2)
returns 1. 7 Jan 10 is a Thursday, and 4 Jan 10 the Monday of that week.
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