LibreOffice 25.2 Help
The MonthName function returns the localised month name of a specified month number.
        MonthName(Month as Integer [,Abbreviate as Boolean])
    String
Month: Value from 1 to 12, January to December, whose localised month name needs to be returned.
Abbreviate: Optional. A Boolean value that indicates if the month name is to be abbreviated.
        REM  *****  BASIC  *****
        Option VBASupport 1
        Sub Example_MonthName
         Dim mBirthday as Integer
         mBirthday = 1
         print mBirthday &" "& MonthName(mBirthday,False)
        End Sub