=LOOKUP((MID(A1,FIND("-",A1,1)+1,2)*1),{1,2,3,4,5,6,7,8,9,10,11,12},{"January","February","March","April","May","June","July","August","September","October","November","December"})
All on one line, watch out for word-wrap.
Vaya con Dios,
Chuck, CABGx3