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## YEARFRAC

The result is the number of the years (including fractional part) between StartDate and EndDate.

This function is part of the Open Document Format for Office Applications (OpenDocument) standard Version 1.2. (ISO/IEC 26300:2-2015)

#### Syntax

YEARFRAC(StartDate; EndDate [; Basis])

開始日 と 終了日 は、2 つの日付値です。

基準 はオプションのリストから選択され、どのように年が計算されるかを示します。

基準 | 計算
--- | ---
0 or missing | US 方式 (NASD) 、30日×12ヶ月
1 | ひと月または１年の正確な日数
2 | ひと月の正確な日数、１年は 360 日
3 | ひと月の正確な日数、１年は 365 日
4 | ヨーロッパ方式、30日×12ヶ月

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 - Preferences Tools - Options - LibreOffice Calc - Formula, button Details... in section "Detailed Calculation Settings", Conversion from text to number list box.

#### Example

2008 年 1 月 1 日と 2008 年 7 月 1 日までは、2008 年のうち何割なのかを求めます。

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

関連項目

Date & Time Functions

DATE

DATEDIF

DATEVALUE

DAY

DAYS

DAYS360

EASTERSUNDAY

EDATE

EOMONTH

HOUR

[text/scalc/01/func_isoweeknum.xhp#isoweeknum not found].

MINUTE

MONTH

NETWORKDAYS

NETWORKDAYS.INTL

NOW

SECOND

TIME

TIMEVALUE

TODAY

WEEKDAY

WEEKNUM

WEEKNUM_ADD

[text/scalc/01/func_weeknum_ooo.xhp#weeknum_ooo not found].

WORKDAY

WORKDAY.INTL

YEAR

YEARFRAC