Hi Sharon, I have written a code for this a long time ago. Hope this helps..
close all
% Prompt to enter the time using GUI
prompt ={'Enter Start time and End time:'};
dlg_title = 'Time difference calculator';
num_lines=1;
def={'0 0 0 1 1 1'};
str1 = inputdlg(prompt,dlg_title,num_lines,def);
time1=str2num(str1{1});
% get the times
time1hr=time1(1);
time1min=time1(2);
time1sec=time1(3);
time2hr=time1(4);
time2min=time1(5);
time2sec=time1(6);
time1out=(time1hr*60*60)+(time1min*60)+time1sec;
time2out=(time2hr*60*60)+(time2min*60)+time2sec;
% actual calculation
diffInSec=time2out-time1out
diffInMin=diffInSec/60
if diffInMin >60
Hrs=(diffInMin/60)-mod(diffInMin/60,1)
minutes=diffInMin-(Hrs*60)-mod(diffInMin,1)
seconds=diffInSec-(Hrs*60*60)-(minutes*60)
else
afterdecimal=mod(diffInMin,1);
minutes=diffInMin-afterdecimal
seconds=diffInSec-(minutes*60)
end
