Problem:
Determining whether each pair of corresponding dates in columns A & B occur within the same week.
Solution:
Use the WEEKNUM and IF functions as shown in the following formula:
=IF(WEEKNUM(A2,2)=WEEKNUM(B2,2),"Same Week","Different Week")
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i think above function will not work on - 31-Dec-2019 & 01-Jan-2020.
as both dates are in same week, but weeknum will return 52 for 31-Dec-2019 & 01 for 01-Jan-2020