SQL Server Error: Conversion failed when converting date and/or time from character string

Hi team,

Below query resulted in error. Please help to resolve this error.

 Conversion failed when converting date and/or time from character string.

DECLARE @STR VARCHAR (MAX)
Declare @STRAND VARCHAR (MAX)=''
Declare @Where Varchar (MAX)=''
DECLARE @STR_WHERE VARCHAR (MAX) ='' 
 
 
Declare @fromdate datetime='2020-04-10'  

SET @STR=' select  * from employees_Data'

--set @STR_WHERE=' where Convert(date,DATE_OF_JOINING) = '''+ CAST (@fromdate AS VARCHAR)+''''
set @STR_WHERE='and Convert(date,DATE_OF_JOINING) = CONVERT(date,'''+@fromDate+''')'

PRINT @STR + @Where +  @STR_WHERE + '  order by 1 desc'

EXEC (@STR + @Where +  @STR_WHERE + '  order by 1 desc')