# SAMEPERIODLASTYEAR

Returns a table that contains a column of dates shifted one year back in time from the dates in the specified dates column, in the current context.

## Syntax

SAMEPERIODLASTYEAR(<dates>)


### Parameters

Term Definition
dates A column containing dates.

## Return value

A single-column table of date values.

## Remarks

• 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.

• The dates returned are the same as the dates returned by this equivalent formula: DATEADD(dates, -1, year)

• 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 year sales of Reseller sales.

= CALCULATE(SUM(ResellerSales_USD[SalesAmount_USD]), SAMEPERIODLASTYEAR(DateTime[DateKey]))