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3.5.9.20 WeekNum

1 Description
2 Syntax
3 Parameters
4 Return
5 Example
6 See Also

Description

Returns a number that indicates where the week falls numerically within a year. We assume that the week containing January 1st is the first week of the year.

See this note.

Syntax

 double WeekNum(double d[, int n1, int n2])

Parameters

is a Julian Date Value which can include Time

is a integer value, there are two options

1 (default)	Week starts on Sunday
2	Week starts on Monday

n2(2025)

decides which week is the first week of the year

1 (default)	Week containing January 1 is the first week of the year
2	Week that has at least four days in the new year (complies with ISO standard 8601, section 3.17) is the first week of the year

Return

If it is a Julian days date, return the calendar week number of the year, 1 to 53.

If it is not a Julian days date, return -1/(2025)missing value.

Example

int rr=weeknum(date(1/11/2009));
rr= ; // Should return where the week falls numerically within a year, 3.

int rr=weeknum(2454842,2);
rr=; // Should return where the week falls numerically within a year, 2.

//January 1, 2022 is on Saturday
WeekNum(date(1/1/2022),1,1)=;//return 1
WeekNum(date(1/1/2022),1,2)=;//return 52