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# Date & Time Functions

These spreadsheet functions are used for inserting and editing dates and times.

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Insert - Function - Category Date & Time

The functions whose names end with _ADD or _EXCEL2003 return the same results as the corresponding Microsoft Excel 2003 functions without the suffix. Use the functions without suffix to get results based on international standards.

LibreOffice internally handles a date/time value as a numerical value. If you assign the numbering format "Number" to a date or time value, it is converted to a number. For example, 2000-01-01 12:00 PM, converts to 36526.5. The value preceding the decimal point corresponds to the date; the value following the decimal point corresponds to the time. If you do not want to see this type of numerical date or time representation, change the number format (date or time) accordingly. To do this, select the cell containing the date or time value, call its context menu and select Format Cells. The Numbers tab page contains the functions for defining the number format.

## Data bazo por tago nul

Datoj kalkuliĝas kiel la diferenco inter la dato kaj arbitra tago nul. Vi povas agordi la tagon nul esti iu el ja jenaj:

Data bazo | Uzi
--- | ---
'1899-12-30' | (apriora)
'1900-01-01' | (uzita en antaŭa StarCalc 1.0)
'1904-01-01' | (uzata de Apple-programaroj)

Elektu je LibreOffice - PreferencesIloj - Agordaĵoj - LibreOffice Tabelilo - Kalkuli por elekti la datan bazon.

Kiam oni kopias kaj algluas ĉelojn kun dataj valoroj inter diversaj kalkultabeloj, ambaŭ kalkultabelaj dokumentoj devas esti agorditaj al la sama data bazo. Se la dataj bazoj malsamas, la vidigitaj dataj valoroj ŝanĝiĝos!

## Duciferaj jaroj

In LibreOffice - PreferencesTools - Options - LibreOffice - General you find the area Year (two digits). This sets the period for which two-digit information applies. Note that changes made here have an effect on some of the following functions.

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.

Time zone information is not used in Date and Time functions and cells.

## Funkcioj

Date & Time Functions

DATO

DATOSE

DATOVALORO

TAGO

TAGOJ

TAGOJ360

DAYSINMONTH

DAYSINYEAR

PASKADIMANĈO

FINDAT

MONFIN

HORO

ISLEAPYEAR

NRO.SEMAJNO.ISO

MINUTO

MONATO

MONTHS

NETWORKDAYS

NETWORKDAYS.INTL

NUN

SEKUNDO

HORO

TEMPOVALORO

HODIAŬ

WEEKDAY

NRO.SEMAJNO

SEMAJNONUMERO_ADD

NRO.SEMAJNO.OOO

WEEKS

WEEKSINYEAR

LABORTAGO

WORKDAY.INTL

JARO

JARFRAKCI

YEARS

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Functions by Category

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