Set modification time in matlab

问题

I can get modification time in matlab by:

>> f = dir('my_filename.dat');
>> f.date

But how can I change it?

回答1:

This is can be done using Java&Matlab:

import java.io.File java.text.SimpleDateFormat
f = File('my_filename.dat');
sdf = SimpleDateFormat('HH:mm dd/MM/yyyy');
newDate = sdf.parse('12:34 10/12/2010');
f.setLastModified(newDate.getTime);

回答2:

To set the date to the current date you can write something to the file:

fid = fopen('my_filename.dat', 'r+');
byte = fread(fid, 1);
fseek(fid, 0, 'bof');
fwrite(fid, byte);
fclose(fid);

Here, I read a single byte from the beginning of the file, and I write it back.

If you want to set it to something else, you can do it with a system call. On linux you can use touch for that:

system('touch -d "2012-10-01" my_filename.dat');

Similar command exists for windows (Touch) in the Win32 Console ToolBox 1.0

回答3:

Building on the Java solution:

function setFileDate(fn,date)
% date needs to be UTC I think

java.io.File(fn).setLastModified(etime(datevec(date),[1970 1 1 0 0 0])*1000);

Or

function updateFileDate(fn)
java.io.File(fn).setLastModified(java.lang.System.currentTimeMillis)

来源：https://stackoverflow.com/questions/13030143/set-modification-time-in-matlab