How to get time in hours minutes and seconds subtract between two varchar t

Hi all,
I have two varchar variable which has value like this
v_outpunch1:='17:50:00'
and v_Shifttime:='18:00:00'
this both time i am subtracting here and storing in another varchar variable
which is like this.
v_EarlyLeaverstimeformat := LPAD((extract(hour from TO_TIMESTAMP (v_ShiftTime,'HH24:mi:ss')) - extract(hour from TO_TIMESTAMP (v_OutPunch1,'HH24:mi:ss'))), 2, '0')||':'|| LPAD((extract(minute from TO_TIMESTAMP (v_ShiftTime,'HH24:mi:ss')) - extract(minute from TO_TIMESTAMP (v_OutPunch1,'HH24:mi:ss'))), 2, '0')||':'|| LPAD((extract(second from TO_TIMESTAMP (v_ShiftTime,'HH24:mi:ss')) - extract(second from TO_TIMESTAMP (v_OutPunch1,'HH24:mi:ss'))), 2, '0');
it's not subtracting value correctly.
thanks

You shouldn't store time information in a varchar2, but if you do
declare
v_outpunch1 varchar2(100);
v_Shifttime varchar2(100);
v_EarlyLeaverstimeformat varchar2(100);
begin
v_outpunch1:='17:50:23';
v_Shifttime:='18:00:00';
v_EarlyLeaverstimeformat := numtodsinterval( to_date( v_Shifttime, 'hh24:mi:ss' ) - to_date( v_outpunch1, 'hh24:mi:ss' ), 'day' );
dbms_output.put_line( v_EarlyLeaverstimeformat );
v_EarlyLeaverstimeformat := to_char( trunc( sysdate ) + ( to_date( v_Shifttime, 'hh24:mi:ss' ) - to_date( v_outpunch1, 'hh24:mi:ss' ) ), 'hh24:mi:ss' );
dbms_output.put_line( v_EarlyLeaverstimeformat );
end;

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