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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)

### Notkun

YEARFRAC(StartDate; EndDate [; Basis])

StartDate and EndDate are two date values.

Basis (optional) is chosen from a list of options and indicates how the year is to be calculated.

Grunnatriði | Útreikningur
--- | ---
0 or missing | US method (NASD), 12 months of 30 days each
1 | Exact number of days in months, exact number of days in year
2 | Exact number of days in month, year has 360 days
3 | Exact number of days in month, year has 365 days
4 | European method, 12 months of 30 days each

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

### Dæmi

What fraction of the year 2008 lies between 2008-01-01 and 2008-07-01?

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

Tengt efni

Date & Time Functions

DAGS

DATEDIF

DATEVALUE

DAY

DAYS

DAYS360

DAYSINMONTH

DAYSINYEAR

EASTERSUNDAY

EDATE

EOMONTH

HOUR

ISLEAPYEAR

ISOWEEKNUM

MINUTE

MÁNUÐIR

MONTHS

NETWORKDAYS

NETWORKDAYS.INTL

NOW

SECOND

TIME

TIMEVALUE

TODAY

WEEKDAY

WEEKNUM

WEEKNUM_EXCEL2003

WEEKNUM_OOO

WEEKS

WEEKSINYEAR

WORKDAY

WORKDAY.INTL

ÁR

YEARFRAC

YEARS