Slicer not working in table

First of create a date table and move your date related calculation there. Also try to prefer datesmtd, totalmtd, datesytd etc for your calculation.

Closing Balance Final = CALCULATE (
[YTD Amount],
FILTER (
all('Date'),
 [MonthEnd] <= MAX ( 'Date'[MonthEnd] )
),[Report] = "Balance Sheet"
)
 
Opening Balance Final =
CALCULATE (
[YTD Amount],
FILTER (
ALLSELECTED('Date'),

'Date'[MonthEnd] <= MAX ( 'Date'[PrevMonthEnd] )
),[Report] = "Balance Sheet" )

How to use time intelligence. Example

MTD Sales = CALCULATE(SUM(Sales[Sales Amount]),DATESMTD('Date'[Date]))
last MTD Sales = CALCULATE(SUM(Sales[Sales Amount]),DATESMTD(dateadd('Date'[Date],-1,MONTH)))
last MTD (complete) Sales =  CALCULATE(SUM(Sales[Sales Amount]),DATESMTD(ENDOFMONTH(dateadd('Date'[Date],-1,MONTH))))
last year MTD (complete) Sales =  CALCULATE(SUM(Sales[Sales Amount]),DATESMTD(ENDOFMONTH(dateadd('Date'[Date],-12,MONTH))))

MTD (Year End) Sales =  CALCULATE(SUM(Sales[Sales Amount]),DATESMTD(ENDOFYEAR('Date'[Date])))
MTD (Last Year End) Sales =  CALCULATE(SUM(Sales[Sales Amount]),DATESMTD(ENDOFYEAR(dateadd('Date'[Date],-12,MONTH),"8/31")))
Rolling 3 = CALCULATE(sum(Sales[Sales Amount]),DATESINPERIOD('Date'[Date],ENDOFMONTH(Sales[Sales Date]),-3,MONTH)) 

Rolling 12 = CALCULATE(sum(Sales[Sales Amount]),DATESINPERIOD('Date'[Date Filer],MAX(Sales[Sales Date]),-12,MONTH))  
3 month back MTD Sales = CALCULATE(SUM(Sales[Sales Amount]),DATESMTD(dateadd('Date'[Date],-3,MONTH)))
 


QTD Sales = CALCULATE(SUM(Sales[Sales Amount]),DATESQTD(('Date'[Date])))

Last QTD Sales = CALCULATE(SUM(Sales[Sales Amount]),DATESQTD(dateadd('Date'[Date],-1,QUARTER)))
Next QTD Sales = CALCULATE(SUM(Sales[Sales Amount]),DATESQTD(dateadd('Date'[Date],1,QUARTER)))

Last year same QTD Sales = CALCULATE(SUM(Sales[Sales Amount]),DATESQTD(dateadd('Date'[Date],-1,Year)))





YTD Sales = CALCULATE(SUM(Sales[Sales Amount]),DATESYTD(('Date'[Date]),"12/31"))
Last YTD Sales = CALCULATE(SUM(Sales[Sales Amount]),DATESYTD(dateadd('Date'[Date],-1,Year),"12/31"))
Last YTD complete Sales = CALCULATE(SUM(Sales[Sales Amount]),DATESYTD(ENDOFYEAR(dateadd('Date'[Date],-1,Year)),"12/31"))
Last to last YTD Sales = CALCULATE(SUM(Sales[Sales Amount]),DATESYTD(dateadd('Date'[Date],-2,Year),"12/31"))
Year behind Sales = CALCULATE(SUM(Sales[Sales Amount]),dateadd('Date'[Date],-1,Year))
2 Year behind Sales = CALCULATE(SUM(Sales[Sales Amount]),dateadd('Date'[Date],-2,Year))

Cumm Sales = CALCULATE(SUM(Sales[Sales Amount]),filter(date,date[date] <=maxx(date,date[date])))

Cumm Sales = CALCULATE(SUM('Fact table'[Sales]),filter(date,date[date] <=maxx(date,date[date]) 
	&& weekday(sales[date]) <=weekday(maxx(date,date[date])) ))


Last YTD complete Sales = CALCULATE(SUM(Sales[Sales Amount]),DATESYTD(ENDOFYEAR(dateadd('Date'[Date],-1,Year)),"12/31"))
Last to last YTD complete Sales = CALCULATE(SUM(Sales[Sales Amount]),DATESYTD(ENDOFYEAR(dateadd('Date'[Date],-2,Year)),"12/31"))

In case you only have month and year

date = date(year(table[year]),month(table[month],1)

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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