Returns the date calculated from a start date with a specific number of work days, before or after the start date. The calculation can include week-ends and holidays as non-working days.
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WORKDAY.INTL(StartDate; Days [; Weekend [; Holidays]])
StartDate: is the date from when the calculation is carried out.
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.
=WORKDAY.INTL(C3;D3) gives the result: January 10, 2017.
Technical information
This function is available since LibreOffice 4.3.
This function is not part of the Open Document Format for Office Applications (OpenDocument) Version 1.3. Part 4: Recalculated Formula (OpenFormula) Format standard. The name space is