Excel already has functions like the **SUMIF** and the **SUMIFS** for summing data by groups. However; they can't work if you have date-time values combined. This article shows *How to sum by date in Excel without time* using **SUMPRODUCT** and **INT** functions.

## Syntax

=SUMPRODUCT( range of values * ( INT( range of date-time ) = cell of date ) )

## Steps

- Start with
**=SUMPRODUCT(**function - Type of select the range that contains values
**$C$3:$C$16** - Use asterisk to product range values with condition range and open a parenthesis
***(** - Continue with
**INT($B$3:$B$16)**to remove the time part - Enter condition with an equal sign and criteria range
**=E3** - Type
**))**to close function and finish the formula

## How

Excel keeps date and time values as numbers. Excel assumes the history starts from Jan 1st, 1900 and accepts this date as 1. While whole numbers represents days, the decimal represents time. For example; *1/1/2018* is equal to *43101*, *12:00* is equal to *0.5*.

We can use the **INT** function to get rid of the time values or decimal part of numbers. The **INT** function simply returns the whole number part from a numeric value. In our case;

INT($B$3:$B$16) returns *{43292;43292;43292;43292;43293;43293;43293;43293;43293;43293;43293;43293;43294;43294}*

However; to make the **INT** function work on an array, we need to use the **SUMPRODUCT** function. The **SUMPRODUCT** function’s ability to handle arrays without using array formulas provides an advantage over the limitations of **SUMIF** and **SUMIFS** functions. The **SUMPRODUCT** can evaluate and return arrays from range – value conditions. We use this functionality to resolve criteria range – criteria pairs.

(INT($B$3:$B$16)=E3) returns *{TRUE;TRUE;TRUE;TRUE;FALSE;FALSE;FALSE;FALSE;FALSE;FALSE;FALSE;FALSE;FALSE;FALSE}*

Also, the **SUMPRODUCT** function sums the values in its argument array if there is only one argument. However, conditional equations returns Boolean values. So, they need to be converted to numbers which are meaningful for the **SUMPRODUCT** function. Fortunately, the product operator (*) does this.

By multiplying a value array with a condition array, we get the array values generated according to our needs.

$C$3:$C$16*(INT($B$3:$B$16)=E3) returns *{1;2;3;4;0;0;0;0;0;0;0;0;0;0}*

Finally, the **SUMPRODUCT** returns the results as sum by date in Excel which is what we are looking for.

=SUMPRODUCT($C$3:$C$16*(INT($B$3:$B$16)=E3)) returns *10* for the date of *7/11/2018.*

## Alternative Option

An alternative way is using *PivotTable* that can give you more options than summing values. You can find detailed information in How to group days without time by Pivot Table.

Also see related articles how to calculate weighted average with SUMPRODUCT, how to SUM 2d ranges with SUMPRODUCT, and how to sum values with OR operator using SUMPRODUCT with multiple criteria.