Date & Time Functions

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

Insert - Function - Category Date&Time

Note.png The functions whose names end with _ADD return the same results as the corresponding Microsoft Excel functions. Use the functions without _ADD to get results based on international standards. For example, the WEEKNUM function calculates the week number of a given date based on international standard ISO 8601, while WEEKNUM_ADD returns the same week number as Microsoft Excel.

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, 01/01/2000 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.

Date base for day zero

Dates are calculated as offsets from a starting day zero. You can set the day zero to be one of the following:

Date base Use
'12/30/1899' (default)
'01/01/1900' (used in former StarCalc 1.0)
'01/01/1904' (used in Apple software)

Choose Tools - Options - LibreOffice Calc - Calculate to select the date base.

Warning.png When you copy and paste cells containing date values between different spreadsheets, both spreadsheet documents must be set to the same date base. If date bases differ, the displayed date values will change!

Two digits years

In Tools - 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.

Note.png When entering dates, slashes or dashes used as date separators may be interpreted as arithmetic operators. Therefore, dates entered in this format are not always recognized as dates and result in erroneous calculations. To keep dates from being interpreted as parts of formulas, place them in quotation marks, for example, "07/20/54".

Functions

YEARFRAC

YEAR

WORKDAY

WEEKNUM_ADD

WEEKNUM

WEEKDAY

TODAY

TIMEVALUE

TIME

SECOND

NOW

NETWORKDAYS

MONTH

MINUTE

HOUR

EOMONTH

EDATE

EASTERSUNDAY

DAYS360

DAYS

DAY

DATEVALUE

DATEDIF

DATE


Related Topics

Calc Functions By Category in the LibreOffice WikiHelp