MATLAB: How to compare 2 different time in matlab

time + compare+matlab

Hi all,
I have 2 different time, 21:45:53 and 21:04:22 , regardless of date( we assume both are in same date), How I can figure out which one is earlier than the other?
I am using
[first_val]=[datenum(time_ir(1,:),'HH:MM:SS'),datenum(time_e_rad(1,:),'HH:MM:SS')];
[early_first,index]=min(first_val);
where time_e_rad(1,:)= 21:45:53 and time_ir(1,:)= 21:04:22
while datenum of both gives me a same number. I understand datenum is using to compare dates and not times! is there anyway to compare two times?
Thanks

Best Answer

I have not reproduced your: while datenum of both gives me a same number.
Should work:
    sdn1 = datenum( '21:45:53', 'HH:MM:SS' );
    sdn2 = datenum( '21:04:22', 'HH:MM:SS' ); 
    format long
    sdn1
    sdn2
returns
    sdn1 =
         7.352359068634260e+05
    sdn2 =
         7.352358780324074e+05
they differ
    >> sdn1 > sdn2
    ans =
         1
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