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Lookup unique cell with date and time combined


Excel Ninja
Another option,

1] Assume your holiday list in range D2:D11

2] In B2, formula copy down :

=IFERROR(IF((LEFT(TEXT(A2,"ddd"))="S")+ISNUMBER(MATCH(INT(A2),$D$2:$D$11,0)),LOOKUP(HOUR(A2),{0;7;22},{"Off peak";"Shoulder";"Off peak"}),LOOKUP(HOUR(A2),{0;7;14;20;22},{"Off peak";"Shoulder";"Peak";"Shoulder";"Off peak"})),"")