# Filter duplicates within same date, week or month

The image above demonstrates a formula in cell E3 that extracts duplicate items if they are on the same date.

Formula in E3:

Copy cell and paste it to cell range E3:F5.

### Explaining formula in cell E3

#### Step 1 - Keep track of previous values

The COUNTIFS function calculates the number of cells across multiple ranges that equals all given conditions. If a date and corresponding item already has been displayed the function returns 1. The cell references grow when the cell is copied to cells below, the formula keeps track of previously shown values.

COUNTIFS($E$2:$E2, $B$3:$B$11, $F$2:$F2, $C$3:$C$11)=0

returns {TRUE; TRUE;... ; TRUE}

#### Step 2 - Find duplicates

COUNTIFS($B$3:$B$11, $B$3:$B$11, $C$3:$C$11, $C$3:$C$11)>1

becomes {2;2;2;2;1;1;1;2;2}>1

and returns {TRUE; TRUE; ... ; TRUE}

#### Step 3 - Multiply arrays

We use AND logic because both conditions must be met.

(COUNTIFS($E$2:$E2, $B$3:$B$11, $F$2:$F2, $C$3:$C$11)=0)*(COUNTIFS($B$3:$B$11, $B$3:$B$11, $C$3:$C$11, $C$3:$C$11)>1)

returns {1;1;1;1;0;0;0;1;1}

#### Step 4 - Divide 1 with array

The LOOKUP function ignores error values and this is what we are going to use. In order to get an error if a value in the array is FALSE or 0 (zero) we divide 1 with 0 and excel returns !DIV/0 error.

1/((COUNTIFS($E$2:$E2, $B$3:$B$11, $F$2:$F2, $C$3:$C$11)=0)*(COUNTIFS($B$3:$B$11, $B$3:$B$11, $C$3:$C$11, $C$3:$C$11)>1))

becomes 1/{1;1;1;1;0;0;0;1;1} and returns {1;1;1;1;#DIV/0!;#DIV/0!;#DIV/0!;1;1}

#### Step 5 - Get value

The LOOKUP function returns a value on the corresponding row if it is not an error value, simplified.

LOOKUP(2, 1/((COUNTIFS($E$2:$E2, $B$3:$B$11, $F$2:$F2, $C$3:$C$11)=0)*(COUNTIFS($B$3:$B$11, $B$3:$B$11, $C$3:$C$11, $C$3:$C$11)>1)), B$3:B$11)

returnsÂ 40189 (1/11/2010) in cell E3.

### Get Excel *.xlsx file

Filter-duplicates-within-same-date-week-month-year.xlsx

### Filter duplicates within same week

Formula in B16:

Array formula in F16:

Copy cell and paste it down as far as needed.

Array formula in G16:

Copy cell and paste it down as far as needed.

### Filter duplicates within same month

Array formula in F29:

Copy cell and paste it down as far as needed.

Array formula in G29:

Copy cell and paste it down as far as needed.

### Get Excel sample file for this article.

Filter-duplicates-within-same-date-week-month-year.xls

(Excel 97-2003 Workbook *.xls)

### Dates category

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This article demonstrates how to match a specified date to date ranges. The image above shows a formula in cell […]

### Duplicate values category

The array formula in cell C2 extracts duplicate values from column A. Only one duplicate of each value is displayed […]

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Oscar,

for the Filter duplicates within same date, week or month in excel

Using the Pic above, if I put instead the a value of 1150 in cell D5, then the formula does not give you the desired result.

Instead of the , I used the = and it works fine.

Formula in G3

=INDEX($D$3:$D$11, SMALL(IF(MATCH($C$3:$C$11&$D$3:$D$11, $C$3:$C$11&$D$3:$D$11, 0)=ROW($C$3:$C$11)-MIN(ROW($C$3:$C$11))+1, ROW($C$3:$C$11)-MIN(ROW($C$3:$C$11))+1, "") , ROW(A1)))

Thanks for your great tutorials

The array formula creates a list of all duplicates. If I change cell D5 to 1150, Date 6-Jan-2010 now have two duplicate values. That is also the result of the array formula.

I am sure I can create an array formula that only show one duplicate value, later.

Thanks for commenting!

Trying to mod the forumla to list 3+ entries the same instead of two duplicates... any suggestions would be amazing?