Hi,

Formula to convert:
=IF(AND($C4<>"",OR(MONTH($C4)=1,MONTH(EDATE($C4,1) )=1,MONTH(EDATE($C4,2))=1)),VLOOKUP($D4,$R$4:$S$5, 2,FALSE),"")
En.excel-translator.de:
=SE(E($C4<>"";O(MESE($C4)=1;MESE(DATA.MESE($C4;1)) =1;MESE(DATA.MESE($C4;2))=1));CERCA.VERT($D4;$R$4: $S$5;2;FALSO);"")
Perfect! I recommend it to everyone.