Switch DAX for Date criteria

[Shabbir_30]

Dear All,
I am working on Attendance report in Power BI , below DAX is working fine for "P" & "WO" , but the moment i add "A" in else part of Switch, it return entire year value in table , instead of selected month from Slicer ,Any suggestion or advice much appreciate, Thank you ,

_Attendance = SWITCH(TRUE(),
COUNTROWS(FILTER(Sheet2 , Sheet2[Login Date] >= RELATED('Calendar'[Date] ) )) = 1,"P",
FORMAT(SELECTEDVALUE('Calendar'[Date]),"DDD") = "Fri" || FORMAT( SELECTEDVALUE('Calendar'[Date]),"DDD")= "Sat", "WO")

[Shabbir_30]

Thank you for your reply, 

ihave little modified DAX : SWITCH to IF , and as suggested instead of A , i have used 
so with this change , 2 things are fixed, one now its only showing selected month date, and instead of blank its is now showing "A", 
:>>> 

_Attendance = if(COUNTROWS(FILTER(Sheet2 , Sheet2[Login Date] >= RELATED('Calendar'[Date] ) )) = 1,"P",

if(FORMAT(SELECTEDVALUE('Calendar'[Date]),"DDD") = "Fri" || FORMAT( SELECTEDVALUE('Calendar'[Date]),"DDD")= "Sat","WO",

if(SELECTEDVALUE('Calendar'[Date]),"A" ))) 

now there one  thing which is slight concern,  for future date it is also showing "A", where for for future date it is expected as Blank

[AlexisOlson]

Does it help if you use SELECTEDVALUE ( 'Calendar'[Date], "A" ) instead of "A" for the else default value?

This should still return blanks when the date is outside of your selected range.