## How does the PREVIOUSDAY function (DAX) work?

The PREVIOUSDAY function (DAX) returns a table that contains a column of all dates representing the day that is previous to the first date in the dates column, in the current context.

PREVIOUSDAY(
<dates>
)

## How do you use the PREVIOUSDAY function?

This function determines the first date in the input parameter, and then returns all dates corresponding to the day previous to that first date. For example, if the first date in the dates argument refers to June 10, 2009; this function returns all dates equal to June 9, 2009.

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## Considerations when using the PREVIOUSDAY function

The dates argument can be any of the following:

• A reference to a date/time column.
• A table expression that returns a single column of date/time values.
• A Boolean expression that defines a single-column table of date/time values.

## Formula examples using the PREVIOUSDAY function

=CALCULATE(SUM(InternetSales_USD[SalesAmount_USD]), PREVIOUSDAY(‘DateTime'[DateKey]))

= CALCULATE ( SUM (Sales[Sales Amount]),PREVIOUSDAY (Sales[Date]) )

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