Try this..

Declare @EndDate varchar(25)

select @EndDate =CONVERT(varchar,(convert(varchar(10), getdate(), 101) + ' ' + CAST(DATEPART(hh,getdate()) AS VARCHAR) +':'+ CAST(DATEPART(mi,getdate()) as VARCHAR) +':'+ CAST(DATEPART(ss,getdate()) AS VARCHAR)+CAST(DATEPART(ss,getdate()) AS VARCHAR)),109 )

print @EndDate