how to compare 2 different time in 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

Answer 1

[per isakson]

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

Answer 2

[Image Analyst]

They are not the same number. The bigger number is the later time:

serialDate1 = datenum('21:45:53')
serialDate2 = datenum('21:04:22')

serialDate1 =
          735235.906863426
serialDate2 =
          735235.878032407

Answer 3

[saharsahar]

Thank u very much. I got the point. Appreciated !