LibreOffice spreadsheet autoformat

how does libreoffice spreadsheet autofill work for months? I can only get it to autofill days, not months
example:
I want
02/18
03/18

it gives me
02/01/18
02/02/18

I have input the formula I want in format cells. It’s like it doesn’t understand it.
Thanks in advance 8)

Hi

  • Select the range (including source cell and target cells)
  • Use SheetFill CellsSeriesTime unitMonth

Regards