Show same dates every month.

This also works:
For the 1st date
=DATEVALUE(CONCATENATE("22/",LEFT($B2,FIND("'",$B2)-1),"/",RIGHT($B2,2)))
For the 2nd date
=DATEVALUE(CONCATENATE("26/",MATCH(LEFT($B2,FIND("'",$B2)-1),$N$2:$N$13,0)+1,"/",RIGHT($B2,2)))

if N2:N13 contains a list of January, February, March etc.

Domski's solution is better I think.