Module
Contents
Index 🔎︎

## YEARFRAC

返回的结果为 起始日期 和 结束日期 之间相差的年数，包括小数部分。

### Syntax

YEARFRAC(StartDate; EndDate; Basis)

StartDate 和 EndDate 是两个日期值。

Basis 是从选项列表中选择的，并指明计算年的方式。

基准 | 计算
0 or missing | 美国方法(NASD)，12个月且每月为30天
1 | 一个月中的确切天数，一年中的确切天数
2 | 一个月中的确切天数，一年有 360 天
3 | 一个月中的确切天数，一年有 365 天
4 | 欧洲方法，12 个月且每月为 30 天

When entering dates as part of formulas, slashes or dashes used as date separators are interpreted as arithmetic operators. Therefore, dates entered in this format are not recognized as dates and result in erroneous calculations. To keep dates from being interpreted as parts of formulas use the DATE function, for example, DATE(1954;7;20), or place the date in quotation marks and use the ISO 8601 notation, for example, "1954-07-20". Avoid using locale dependent date formats such as "07/20/54", the calculation may produce errors if the document is loaded under different locale settings.

Unambiguous conversion is possible for ISO 8601 dates and times in their extended formats with separators. If a #VALUE! error occurs, then unselect Generate #VALUE! error in LibreOffice - PreferencesTools - Options
- LibreOffice Calc - Formula, button Details... in section "Detailed Calculation Settings", Conversion from text to number list box.

### Example

2008-01-01 和 2008-07-01 之间的天数占一年中总天数的份额是多少?

=YEARFRAC("2008-01-01"; "2008-07-01";0) returns 0.50.