# Finding time difference that meet criteria

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ALDO on 8 Jul 2020
Commented: ALDO on 1 Aug 2020
Hi guys
I need to compare two columns of data with each other. They are all in time format 00:00:00. I need to group them groups of two which are 20 seconds apart from each other and put the ones meeting the criteria in separate column. it could be 20 seconds before or after each other.
As an example, these consider two columns A and B columns. for example, the first row meets the criteria because it has 2 seconds difference in time which is less than 20.
I would appreciate any help. Thanks in advance!
A B
05:49:13 05:49:15
05:52:41 05:52:42
08:39:43 09:20:44
09:35:52 09:35:52
09:58:14 09:58:27
10:00:11 10:00:02
10:16:48 10:16:41
12:20:08 12:20:08
12:37:41 12:37:53
12:41:09 12:40:54
12:46:20 12:46:32
12:48:18 12:48:19
##### 2 CommentsShowHide 1 older comment
ALDO on 8 Jul 2020
Thank you for your comment. yes deleting them could also work. but I need both the ones that meet critera and the ones that dont. I am new to using datetime so I do not know how to compare them.

jonas on 8 Jul 2020
First make sure your data is in duration format.
%making up some data
t1 = (hours(10):hours(2):hours(24))';
t2 = t1 + rand(numel(t1),1).*seconds(40);
t = [t1,t2];
t.Format = 'hh:mm:ss';
%find time difference less than 20 s
id = abs(t1-t2)<seconds(20);
% remove pairs not meeting criterion
t(~id,:) = []
ALDO on 1 Aug 2020
Hi! I appologize for the delay is my responce. Yes there could be multiple matches for B to one element in A. I will provide real data as soon as I have access to it! Thanks again!