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Applies to: 
Calculated column
Calculated table
Measure 
Visual calculation
Note
This function is discouraged for use in visual calculations as it likely returns meaningless results.
For date column input, 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.
For calendar input, returns a table that is shifted one year back in time from the dates in the current context, based on the calendar. The table contains all primary tagged columns and all time related columns.
Syntax
SAMEPERIODLASTYEAR(<dates> or <calendar>)
Parameters
| Term | Definition |
|---|---|
dates or calendar |
A column that contains dates or a calendar reference |
Return value
For date column input, return a single-column table of date values.
For calendar input, return a table that contains all primary tagged columns and all time related columns.
Remarks
The
datesargument 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]))
Special behavior
When the selection includes last two days of month, SAMEPERIODLASTYEAR will use "extension" semantics and will include the days till the end of month. For example, when Feb 27 and 28 of 2009 are included in the selection, SAMEPERIODLASTYEAR will return Feb 27 to 29 of 2008.
This behavior only happens when last two days of month are included in the selection. If only Feb 27 is selected, it will go to Feb 27.
= SAMEPERIODLASTYEAR(DateTime[DateKey])
Example for calendar based time intelligence
The following sample formula creates a measure that calculates the previous year sales of Reseller sales.
= CALCULATE(SUM(ResellerSales_USD[SalesAmount_USD]), SAMEPERIODLASTYEAR(FiscalCalendar))
Differences in behavior between classic and calendar time intelligence
Some scenarios may yield different results when comparing classic and calendar time intelligence. For example, in a lunar year, SamePeriodLastYear will produce different results at the date granularity. In calendar-based time intelligence, shifting Feb 29 2008 back one year results in Mar 1 2007, because it is treated as the 60th day of the year. In classic time intelligence, the same shift returns Feb 28 2007. The workaround is to use DATEADD(Calendar, -<number of a year>, month). For example, if a year has 13 months in calendar, use DATEADD(Calendar, -13, month). This approach will shift by month so Feb 2008 will go to Feb 2007.
Related content
Time intelligence functions Date and time functions PREVIOUSYEAR PARALLELPERIOD