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## WEEKNUM_ADD

WEEKNUM 计算内部日期值中一年的周数。

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.

### 语法

WEEKNUM(Number; Mode)

value是日期的内部序列数。

mode 参数指定的是计算方式，即指定哪一天应该是每周的第一天。

1 = 星期天

2 = Monday (ISO 8601)

any other value = Monday (ISO 8601)

### 示例

=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.