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Excel Formula: Count Day of Week in A Date Range

Author: Sun Last Modified: 2020-12-04

doc convert date to julia 1

If there is a list of dates, how can you count a certain day of week in such a list of dates as above screenshot shown?

If you want to follow along with this tutorial, please download the example spreadsheet.
doc convert date to julia 1

Generic formula:

SUMPRODUCT(--(WEEKDAY(date_range)=week_day))

Syntaxt and Arguments

Date_range: the references of dates that you want to count number of a specific weekday within.
Week_day: a number that indicates the day of week.

Week_day number

Weekday  Number 
 Sunday
 Monday
 Tuesday
 Wednesday
 Thursday
 Friday
 Saturday

Return Value

The formula returns to a numeric value.

How this formula works

For instance, the range B3:B10 list dates, and the corresponding weekday numbers list in the range F3:F9, now you need to count each day of week in this date range, please use below formula:

=SUMPRODUCT(--(WEEKDAY($B$3:$B$10)=F3))

Press Enter key to get the first counting result.
doc convert date to julia 1

Drag auto fill handle over cells to apply this formula as you need.
doc convert date to julia 1

Explanation

WEEKDAY function: counts the weekday in a date range. The formula WEEKDAY($B$3:$B$10) returns an array result:
{6;6;3;1;3;7;1;6}

The formula =(WEEKDAY($B$3:$B$10)=F3) returns an array result:
{FALSE; FALSE; FALSE; FALSE; FALSE; FALSE; FALSE; FALSE}

SUMPRODUCT function: returns the result of multiplied and summed arrays.
=SUMPRODUCT(--(WEEKDAY($B$3:$B$10)=F3))
=SUMPRODUCT(--{FALSE; FALSE; FALSE; FALSE; FALSE; FALSE; FALSE; FALSE})
=0

In the formula
= SUMPRODUCT(--(WEEKDAY($B$3:$B$10)=F4))
= SUMPRODUCT(--{FALSE; FALSE; TRUE; FALSE; TRUE; FALSE; FALSE; FALSE}
=2


Relative Formulas

Relative Functions


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