Previous date range based on slicer

Please find the logic. Added logic to adjust the end of the month. if needed you can remove that. 30Th Jun will give 30jan or 30th march not 31st so done the coding for that.

Same Month range last period = 
var _diff = datediff(MIN('Date'[date]),max('Date'[date]),MONTH)
var _p_st_date = MINX('Date',DATEADD('Date'[date],-1*_diff,MONTH))
var _maxDt =maxx('Date','Date'[date])
var _maxEndDt =maxx('Date',ENDOFMONTH('Date'[date]))


var _p_end_date = if(_maxDt<>_maxEndDt, MAXX('Date',DATEADD('Date'[date],-1*_diff,MONTH)),MAXX('Date',ENDOFMONTH(DATEADD('Date'[date],-1*_diff,MONTH))))
Return
//_p_st_date & " " & _p_end_date & " " &_maxDt &" " &_maxEndDt
CALCULATE(sum(Sales[Sales Amount]),all('Date'[date]),'Date'[date]>=_p_st_date && 'Date'[date]<= _p_end_date)

If you need only days

Same Date range last period = 
var _diff = datediff(MIN('Date'[date]),max('Date'[date]),DAY)
var _p_st_date = MINX('Date',DATEADD('Date'[date],-1*_diff,Day))-1
var _p_end_date = MAXX('Date',DATEADD('Date'[date],-1*_diff,Day))-1
Return
CALCULATE(sum(Sales[Sales Amount]),all('Date'[date]),'Date'[date]>=_p_st_date && 'Date'[date]<= _p_end_date
)

The assumption is that you have a date range slicer (or month) and you are using date table.

To get the best of the time intelligence function. Make sure you have a date calendar and it has been marked as the date in model view. Also, join it with the date column of your fact/s.

Refer
https://radacad.com/creating-calendar-table-in-power-bi-using-dax-functions
https://www.archerpoint.com/blog/Posts/creating-date-table-power-bi

https://www.sqlbi.com/articles/creating-a-simple-date-table-in-dax/

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