3.5.9.19 WeekNumWeekNum-func
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 n, int n2])
Parameters
d
- is a Julian Date Value which can include Time
n
- is a integer value, there are two options
| 1 (default)
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Week starts on Sunday
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| 2
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Week starts on Monday
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n2(2025)
- decides which week is the first week of the year
| 1 (default)
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Week containing January 1 is the first week of the year
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| 2
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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
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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
See Also
WeekDay, Year, Month, Day, Hour, Minute, Second, Now,
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