MTD Changes over selected month

[Kalyani2009]

I am trying following dax for current month MTD but I am getting trouble when selecting other months.

MTD Purchase count-

IF (

DAY ( TODAY () ) = 1 && MONTH(TODAY())=1,

CALCULATE (

DISTINCTCOUNT(tracksales[MobileNumber]),

DATESBETWEEN (

DimDate[FullDateAlternateKey],

DATE ( YEAR ( TODAY () )-1, 12, 1 ),

DATE ( YEAR ( TODAY () )-1, MONTH ( TODAY () )-1, DAY(EOMONTH(TODAY()-1,0)))

)

),

IF (

DAY ( TODAY () ) = 1,

CALCULATE (

DISTINCTCOUNT(tracksales[MobileNumber]),

DATESBETWEEN (

DimDate[FullDateAlternateKey],

DATE ( YEAR ( TODAY () ), MONTH ( TODAY () )-1, 1 ),

DATE ( YEAR ( TODAY () ), MONTH ( TODAY () )-1, DAY(EOMONTH(TODAY()-1,0)))

)

),

CALCULATE (DISTINCTCOUNT(tracksales[MobileNumber])

,

DATESBETWEEN (

DimDate[FullDateAlternateKey],

DATE ( YEAR ( TODAY () ), MONTH ( TODAY () ), 1 ),

TODAY () -1

)

)

))

and then i am using following dax for toggle-

MTD  Purchase =

IF (

ISCROSSFILTERED ( 'Counts/volume'[UNITS/VOLUME]) ,

IF(

SELECTEDVALUE( 'Counts/volume'[UNITS/VOLUME])="VOLUME"

,[MTD purchase Volume],

if(

SELECTEDVALUE( 'Counts/volume'[UNITS/VOLUME])="UNITS"

,[MTD purchase Count]

))

,[MTD purchase Count]

)

so please help me to make this dynamic.

[Anonymous]

@Kalyani2009 

Please do not try to re-invent the wheel. Use the tried and tested techniques that use the in-built time intelligence. Also, interleaving code with TODAY() is making your code rigid. By doing that you are making sure that the code will not be flexible. Here's something to get you started on your way to the correct solution: Time Intelligence in Power BI Desktop - SQLBI

Use the Search capability of the above site to look for things of interest.