conditional format duplicate value to include adjacent cell in another column

I have a column of dates in order in col A. Sometimes a date is repeated in an adjacent row. I would like to highlight these cells which are repeated and the corresponding next cell to right, B1, B2, B3, etc.
I know how to get the repeated cells in Col A highlighted using "Duplicate Values" in Conditional format, but how do I include the corresponding cells in col B?

EX:
A1 1/1/17
A2 1/2/17
A3 1/3/17-highlighted
A4 1/3/17-highlighted
A5 1/4/17
A6 1/5/17

I want B3 & B4 included in the conditional format so B3 & B4 are also highlighted.

Thank you.

Select A1:B6
if CF use: =COUNTIF($A$1:$A$6,$A1)>1
set color

thanks for help

Welcome

read my dancing footnote

sandy666,
Regarding your formula, =COUNTIF($A$1:$A$6,$A1)>1
I understand the range, $A$1:$A$6
but how does $A1)>1 find any duplicate in the range?
I assume that >1 looks for any entry that is ">1" or duplicated but the $A1 confuses me. It would seem that it would only look for a duplicate of A1, not any in the entire range. Does the fact that the row [1] is not absolute mean that the query continues thru the range of rows in col A?
I assume that by including col B that it would extend the range of the CF to include col B in any found rows in col A.
Thank you.
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