IF functions when adding and subtracting time

I want to make rules in Column D of attached file
wherein:
if C is within +/- of A = OK
if C is outsine +/- of A= Out

Can anyone help me with this?

Thank you in advance

Copy of excel file.xls

See attached file for used formulas.

Dear @robertswart,

Thank you very much.
Great help.

@robertswart,

how about if C is within + of A

Thanks again

hi allan223

Formula:

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Hi Kevin UK

Thanks a lot.