Add-in Functions
The following describes and lists some of the available add-in functions.
You will also find a description of the LibreOffice Calc add-in interface in the Help. In addition, important functions and their parameters are described in the Help for the Shared LibraryLibreOffice Calc add-in DLL.
Add-ins supplied
LibreOffice contains examples for the add-in interface of LibreOffice Calc.
\<bookmark_value\>DAYSINMONTH function\</bookmark_value\>\<bookmark_value\>number of days;in a specific month of a year\</bookmark_value\>DAYSINMONTH
Calculates the number of days of the month in which the date entered occurs.
DAYSINMONTH(Date)
Date: Any date in the respective month of the desired year. The Date parameter must be a valid date according to the locale settings of LibreOffice.
DAYSINMONTH(A1) returns 29 days if A1 contains 2/17/68, a valid date for February 1968.
ORG.OPENOFFICE.DAYSINMONTH
\<bookmark_value\>DAYSINYEAR function\</bookmark_value\>\<bookmark_value\>number of days; in a specific year\</bookmark_value\>
DAYSINYEAR
Calculates the number of days of the year in which the date entered occurs.
DAYSINYEAR(Date)
Date: Any date in the respective year. The Date parameter must be a valid date according to the locale settings of LibreOffice.
DAYSINYEAR(A1) returns 366 days if A1 contains 2/29/68, a valid date for the year 1968.
ORG.OPENOFFICE.DAYSINYEAR
\<bookmark_value\>ISLEAPYEAR function\</bookmark_value\>\<bookmark_value\>leap year determination\</bookmark_value\>
ISLEAPYEAR
Determines whether a year is a leap year. If yes, the function will return the value 1 (TRUE); if not, it will return 0 (FALSE).
ISLEAPYEAR(Date)
Date specifies whether a given date falls within a leap year. The Date parameter must be a valid date.
Microsoft Excel wrongly assumes year 1900 to be a leap year and considers the inexistent day of 1900-02-29 as valid in date calculations. Dates prior to 1900-03-01 are therefore different in Excel and Calc.
ISLEAPYEAR(A1) returns 1, if A1 contains 2/29/68, the valid date 29th of February 1968 in your locale setting.
You may also use =ISLEAPYEAR(DATE(1968;2;29)) or =ISLEAPYEAR("1968-02-29") giving the date string in the ISO 8601 notation.
Never use ISLEAPYEAR(2/29/68), because this would first evaluate 2 divided by 29 devided by 68, and then calculate the ISLEAPYEAR function from this small number as a serial date number.
ORG.OPENOFFICE.ISLEAPYEAR
\<bookmark_value\>MONTHS function\</bookmark_value\>\<bookmark_value\>number of months between two dates\</bookmark_value\>
MONTHS
Calculates the difference in months between two dates.
MONTHS(Start date, End date, Type)
Start date: First date
End date: Second date
Type: Calculates the type of difference. Possible values include 0 (interval) and 1 (in calendar months).
ORG.OPENOFFICE.MONTHS
\<bookmark_value\>ROT13 function\</bookmark_value\>\<bookmark_value\>encrypting text\</bookmark_value\>
ROT13
Encrypts a character string by moving the characters 13 positions in the alphabet. After the letter Z, the alphabet begins again (Rotation). By applying the encryption function again to the resulting code, you can decrypt the text.
ROT13(Text)
Text: Enter the character string to be encrypted. ROT13(ROT13(Text)) decrypts the code.
=ROT13("Gur Qbphzrag Sbhaqngvba jnf sbhaqrq va Frcgrzore 2010.") returns the string "The Document Foundation was founded in September 2010.". Notice how spaces, digits, and full stops are unaffected by ROT13.
ORG.OPENOFFICE.ROT13
Refer to the ROT13 wiki page for more details about this function.
\<bookmark_value\>WEEKS function\</bookmark_value\>\<bookmark_value\>number of weeks;between two dates\</bookmark_value\>
WEEKS
Calculates the difference in weeks between two dates.
WEEKS(Start date, End date, Type)
StartDate is the start date in the interval.
EndDate is the end date in the interval. The end date must be greater than the start date, or else an error is returned.
Type specifies the type of difference to be calculated. Possible values are 0 (time interval) or 1 (calendar weeks).
If Type = 0 the function will assume that 7 days is equivalent to one week without considering any specific day to mark the beginning of a week.
If Type = 1 the function will consider Monday to be the first day of the week. Therefore, except for the start date, each occurrence of a Monday in the interval is counted as an additional week.
This function considers Monday to be the first day of the week regardless of the current locale settings.
In the following examples, dates are passed as strings. However, they can also be stored in separate cells and be passed as references.
=WEEKS("2022-01-12","2022-01-17",0) returns 0 because Type was set to 0 and there are only 5 days in the interval.
=WEEKS("2022-01-12","2022-01-19",0) returns 1 because Type was set to 0 and there are 7 days in the interval.
=WEEKS("2022-01-12","2022-01-17",1) returns 1 because Type was set to 1 and the interval contains a Monday, since 2022-01-12 is a Wednesday and 2022-01-17 is a Monday.
=WEEKS("2022-01-12","2022-01-15",1) returns 0 because Type was set to 1 and the interval does not contain any Mondays, except for the start date.
ORG.OPENOFFICE.WEEKS
\<bookmark_value\>WEEKSINYEAR function\</bookmark_value\>\<bookmark_value\>number of weeks;in a specific year\</bookmark_value\>
WEEKSINYEAR
Calculates the number of weeks of the year in which the date entered occurs. The number of weeks is defined as follows: a week that spans two years is added to the year in which most days of that week occur.
WEEKSINYEAR(Date)
Date: Any date in the respective year. The Date parameter must be a valid date according to the locale settings of LibreOffice.
Following ISO 8601, this function considers Monday to be the first day of the week, and the first week of a year is the one with most days in this year.
WEEKSINYEAR(A1) returns 53 if A1 contains 2/17/70, a valid date for the year 1970.
ORG.OPENOFFICE.WEEKSINYEAR
\<bookmark_value\>YEARS function\</bookmark_value\>\<bookmark_value\>number of years between two dates\</bookmark_value\>
YEARS
Calculates the difference in years between two dates.
YEARS(Start date, End date, Type)
Start date: First date
End date: Second date
Type: Calculates the type of difference. Possible values are 0 (interval) and 1 (in calendar years).
ORG.OPENOFFICE.YEARS
Add-ins through LibreOffice API
Add-ins can also be implemented through the LibreOffice API.