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## WEEKNUM

WEEKNUM calculates the week number of the year for the internal date value as defined in ODF OpenFormula and compatible with other spreadsheet applications.

Supported are two week numbering systems:

System 1: The week containing January 1 is the first week of the year, and is numbered week 1.

System 2: The week containing the first Thursday of the year is the first week of the year, and is numbered week 1. That means that week number 1 of any year is the week that contains January 4th. ISO 8601 defines this system and that the week starts on Monday.

### 구문

WEEKNUM(숫자; Mode)

숫자는 날짜의 내부 값입니다.

Mode sets the start of the week and the week numbering system. This parameter is optional, if omitted the default value is 1.

1 = Sunday, system 1

2 = Monday, system 1

11 = Monday, system 1

12 = Tuesday, system 1

13 = Wednesday, system 1

14 = Thursday, system 1

15 = Friday, system 1

16 = Saturday, system 1

17 = Sunday, system 1

21 = Monday, system 2 (ISO 8601)

150 = Monday, system 2 (ISO 8601, for interoperability with Gnumeric)

### 예

=WEEKNUM(DATE(1995;1;1);1) returns 1

=WEEKNUM("1995-01-01";2)는 52를 반환합니다. 만일 한 주의 시작을 월요일로 간주할 경우, 일요일은 그 전주의 마지막 날이 됩니다. 따라서 일요일인 1995년 1월 1일은 이 기준에 따르면 1994년의 마지막 주에 속하게 되고 이것이 입력된 함수의 결과값을 52로 만듭니다.

=WEEKNUM(DATE(1995;1;1);21) returns 52. Week 1 starts on Monday, 1995-01-02.

=WEEKNUM(DATE(1999;1;1);21) returns 53. Week 1 starts on Monday, 1999-01-04.