You could try:
$replace($regexp(I Know (4/25/79 Version),(.*?)\((\d+)/(\d+)/(\d+.*)\),$1 ($3==$2==19$4)),==1==,JAN,==2==,FEB,==3==,MAR,==4==,APR,==5==,MAY,==6==,JUN,==7==,JUL,==8==,AUG,==9==,SEP,==10==,OCT,==11==,NOV,==12==,DEC)
You could try:
$replace($regexp(I Know (4/25/79 Version),(.*?)\((\d+)/(\d+)/(\d+.*)\),$1 ($3==$2==19$4)),==1==,JAN,==2==,FEB,==3==,MAR,==4==,APR,==5==,MAY,==6==,JUN,==7==,JUL,==8==,AUG,==9==,SEP,==10==,OCT,==11==,NOV,==12==,DEC)