Series In Troubled Phase

SERIES IN TROUBLED PHASE

It will be easy in this year even for priest class to crack the missing number X & Y in the following set of series. Let me not WAX eloquent - clues in title and in this sentence are adequate :

J12, F11, M13, A11, M11, J10, J9, A8, S6, X,N4,

D4

J28, F27, M28, A26, M26, J24, J23, A22, S20,

Y, N18, D18