D2 : =IF(DATEDIF($B2,$C2, "M")<3,"YES","NO") E2 : =IF(AND(DATEDIF($B2,$C2, "M")>=3,DATEDIF($B2,$C2, "M")<6),"YES","NO") F2 : =IF(DATEDIF($B2,$C2, "M")>=6,"YES","NO")