Date.WeekOfYear

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Syntax

Date.WeekOfYear(dateTime as any, optional firstDayOfWeek as nullable number) as nullable number

About

Returns a number from 1 to 54 indicating which week of the year the date, dateTime, falls in.

  • dateTime: A datetime value for which the week-of-the-year is determined.

  • firstDayOfWeek: An optional Day.Type value that indicates which day is considered the start of a new week (for example, Day.Sunday). If unspecified, a culture-dependent default is used.

Example 1

Determine which week of the year contains March 27th, 2011.

Usage

Date.WeekOfYear(#date(2011, 03, 27))

Output

14

Example 2

Determine which week of the year contains March 27th, 2011, using Monday as the start of the week.

Usage

Date.WeekOfYear(#date(2011, 03, 27), Day.Monday)

Output

13