how to compare 2 different time in matlab

2013 6 23
3 个回答
回答已采纳
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0 个投票

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

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per isakson
per isakson 2013-6-23
编辑：per isakson 2013-6-23

3 个投票

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

更多回答（2 个）

Image Analyst
Image Analyst 2013-6-23

0 个投票

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
saharsahar
saharsahar 2013-6-23

0 个投票

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

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