Need help including YEARS & MONTHS in Clock Countdown Expression

[bestifusedbyjars]

(Years) YY= ??
(Months) MM = ??
DD = Parent group’s date - clock’s current date/time :format as seconds / 60 / 60 / 24 modulo 365 - 0.5 :rounded to 0
HH = Parent group’s date - clock’s current date/time :format as seconds / 60 / 60 modulo 24 - 0.5 :rounded to 0
MM = Parent group’s date - clock’s current date/time :format as seconds / 60 modulo 60 - 0.5 :rounded to 0
SS = Parent group’s date - clock’s current date/time :format as seconds modulo 60