criteria for 1 column for average of 2nd column

i need to do a conditional average formula.

in col B, i have a bunch of data.

in col A, I have a date.

i want a formula that looks at col a, makes sure anything after 1/1/2018 is no counted, and so only takes an average of values col B where col A is before 2018.
finnstoneAsked:
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Saqib Husain, SyedEngineerCommented:
Something like

=AVERAGEIF(A2:A6,"<="&VALUE("1/1/2018"),B2:B6)
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Subodh Tiwari (Neeraj)Excel & VBA ExpertCommented:
<= operator will not exclude 1/1/18 from the average calculation, it should be...
=AVERAGEIF(A2:A6,"<"&VALUE("1/1/2018"),B2:B6)

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