# PREVIOUSDAY

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.

## Syntax

PREVIOUSDAY(<dates>)


### Parameters

Term Definition
dates A column containing dates.

## Return value

A table containing a single column of date values.

## Remarks

• 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.

• 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.
• Constraints on Boolean expressions are described in the topic, CALCULATE function.

• This function is not supported for use in DirectQuery mode when used in calculated columns or row-level security (RLS) rules.

## Example

The following sample formula creates a measure that calculates the 'previous day sales' for Internet sales.

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