SUM COLUMN varchar...convert...cast?

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SQL

I try...but I just have result records for one day...3 records for one date...lst date...I need sum all records from one day...
result of my code is:

          iznos_sa_pdv           ukupno
1             42.12                NULL

2             47,524.23            NULL

3            616.80                NULL

I need sum records by date....my result is 3 records for today day

What I have tried:

select [iznos_sa_pdv], sum(cast(Try_convert(int,[iznos_sa_pdv])AS decimal)) AS ukupno
from mp_kasa_lista
 WHERE [datum] >= CONVERT(datetime, convert(varchar(10), GETDATE() ,120), 120)
AND   datum <  DATEADD(day, 1, convert(datetime, convert(varchar(10), getdate(), 120), 120))
group by iznos_sa_pdv