In creating the remote view... I add a field called "END_TIME" by multiple Field "appt_duration" by 60 AND adding a datetime field called "Appt_time" as follows:

SELECT Appt_table.id, Appt_table.case_no, Appt_table.appt_time,;
  Appt_table.appt_duration, Appt_table.cliniccode, Appt_table.remark,;
  Appt_table.appt_time+ Appt_table.appt_duration*60 as end_time;
 FROM appt_table Appt_table;
 WHERE  Appt_table.appt_time BETWEEN ?weekday1 AND ?weekday2;
 ORDER BY Appt_table.appt_time, Appt_table.cliniccode

I try to set the field "END_TIME" to datetime rather than B(2), but there is an error say I need to convert to other datatype?!