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Yu Li
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anyway to compare date in Matlab

Asked by Yu Li
on 20 Mar 2019
Latest activity Commented on by Star Strider
on 21 Mar 2019
I have two file with the same name, but different location, for example:
file1: D:/test/abc.m
file2: E:/test/abc.m
one of them has been updated. I could check the last modified name by:
filenames1=dir'(D:/test/);
time_file1=filenames(3).date;
filenames2=dir'(E:/test/);
time_file2=filenames(3).date;
the 'time_file1' and 'time_file2' represents the last modified time of these two files, the format is like: '22-Jan-2019 08:43:06'
my question is:
is there anyway to know which is ealier/later, so that I can keep the latest one for use, with out left-click, then property, to look at.
Bests,
Yu

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2 Answers

Answer by Star Strider
on 20 Mar 2019
 Accepted Answer

It might be easier to use the datenum field instead if you simply want to compare dates:
filenames1=dir'(D:/test/);
time_file1=filenames(3).datenum;
filenames2=dir'(E:/test/);
time_file2=filenames(3).datenum;
datediff = time_file1 - time_file2;

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Show 1 older comment
The larger number is the later date.
Try this:
dn1 = datenum('20-Mar-2019','dd-mmm-yyyy')
dn2 = datenum('21-Mar-2019','dd-mmm-yyyy')
datdif = dn2 - dn1
if datdif < 0
fprintf('Date: ‘%s’ is earlier than date: ‘%s’\n', datestr(dn2), datestr(dn1))
elseif datdif > 0
fprintf('Date: ‘%s’ is later than date: ‘%s’\n', datestr(dn2), datestr(dn1))
end
Experiment with the different dates in the date numbers.
Yu Li
on 21 Mar 2019
Hi:
Thanks for your reply.
one point can not assure the judgement is right. I think knowing the internal method of how these two translate between each other would be more reasonable.
I'm contacting Mathworks Tech Support regarding it, and will come back here after I receive a appropriate solution.
Bests,
Yu
My pleasure.

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Answer by Pruthvi Raj Gampalwar on 20 Mar 2019

[~,Data] = dos('dir D:/test/abc.m');
Scanned_data = textscan(Data,'%s');
Date_modified = Scanned_data{1}{15};

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