The new requirement need a helper column to adjust the Date Lookup Range, the revision as in :
1] Helper column, M3 enter :
=A4 and Custom Cell Format >> "Helper";;;
2] Helper column, M4 formula copy down :
=IF(ISNUMBER(MATCH(1,INDEX((Permanent!$A$3:$A$14=$A4)*(Permanent!$B$3:$B$14=$B4)+(Temporary!$A$3:$A$14=$A4)*(Temporary!$B$3:$B$14=$B4),0),0)),A4,M3)
3] In C4, formula copy across and down :
=IFERROR(1/(1/INDEX(Permanent!$C$3:$L$14,MATCH(1,INDEX((Permanent!$A$3:$A$14=$M4)*(Permanent!$B$3:$B$14=$B4),0),0),MATCH(C$3,Permanent!$C$2:$L$2,0))),IFERROR(1/(1/INDEX(Temporary!$C$3:$L$14,MATCH(1,INDEX((Temporary!$A$3:$A$14=$M4)*(Temporary!$B$3:$B$14=$B4),0),0),MATCH(C$3,Temporary!$C$2:$L$2,0))),""))
Regards
Bosco