Copyfile doesn't preserve timestamp

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Vincenzo
Vincenzo 2020-7-19
评论： Walter Roberson 2020-7-21
[status, msg, msgID] = copyfile(filePath1, filePath2);
This line copies a file from a local directory into a USB drive, but the timestamp is not preserved, and the current time is used instead.
Why does this happen if the documentation says the opposite?
MATLAB R2019b, macOS High Sierra 10.13.6
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Stephen23
Stephen23 2020-7-20
Vincenzo'S "Answer" moved here:
I also observed that this behaviour is somewhat file-dependent.
On one file I get the same modified date as the original copy, on other ones (a .dmg file, a .png file) I get the current time as the modified date.
Strangely, the creation date is set for both at an arbitrary date, to which I see no link with the original copies.
Stephen23
Stephen23 2020-7-20
Vincenzo's "Answer" moved here:
https://it.mathworks.com/matlabcentral/answers/567396-copyfile-doesn-t-preserve-timestamp#comment_942210
Let me disagree here. The documentation doesn't specify an OS-dependent compatibility, so if it's an OS-dependent issue, it means it's an OS-dependent bug in TMW-specific code. It would be useful to compare results to analyze different behaviours and possibly raise a bug fix request to The Mathworks.

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回答（1 个）

Image Analyst
Image Analyst 2020-7-20
Windows has 3 dates: modified date, created date, and accessed date. Maybe macOS is the same. For Windows 10, the modified date is the same as it was. The Created date and the Accessed date of the new file are the current time that copyfile() was executed. The documentation only says "After a successful copyfile operation, the timestamp for the new file is the same as the timestamp for source." I agree this is ambiguous when the operating system maintains 3 dates for the files. It could be more explicit on what "timestamp" means especially when only one of the timestamps is the same and two will be different. You could click the single star at the bottom of the documentation and then put in your suggestion (like I just did). I know people do read those suggestions.
MATLAB also does not seem to have a touch function so perhaps you can use system() to run such a command after you run copyfile(), if your operating system has such a touch function.
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dpb
dpb 2020-7-21
If you can create a reproducible test case that illustrates a problem, submit a formal bug report to TMW. Answers is NOT official support. See "Contact Us" (the old-style telephone receiver) icon at top of page or email support@mathworks.com
Walter Roberson
Walter Roberson 2020-7-21
For folder synchronization you should consider system() of rsync

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