Documentation/How Tos/Calc: WEEKNUM function

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

To mimic the non-ISO behaviour of the Excel WEEKNUM function, use WEEKNUM_ADD.

Example:

WEEKNUM("2010-01-07"; 2)

returns 1. 7Jan10 is a Thursday, and 4Jan10 the Monday of that week.

Issues:

• WEEKNUM is called ISOWEEKNUM in the forthcoming ODFF standard.