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## WEEKNUM_ADD

WEEKNUM 計算內部日期值當年的週數。

This function exists for interoperability with LibreOffice releases older than 5.1.0 and OpenOffice.org. It calculates week numbers for a week numbering system in that week number 1 is the week that contains the January 4th. This function does not provide interoperability with other spreadsheet applications. For new documents use the WEEKNUM or ISOWEEKNUM function instead.

### 語法

WEEKNUM(Number; Mode)

value 是日期的內部數值。

mode 會設定星期的開始及計算方式。

1 = Sonnday

2 = Monday (ISO 8601)

any other value = Monday (ISO 8601)

### 範例

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

=WEEKNUM_OOO(DATE(1995;1;1);2) returns 52. Week 1 starts on Monday, 1995-01-02.