Johannes Schindelin <Johannes.Schindelin@gmx.de> writes:

quoted text
> The implementation uses st.st_mtime rather than st.st_ctime,
> because it can be tested better, using 'touch -d <time>' (and
> omitting the test when the platform does not support that
> command line switch).

But I think you can use more portable -t for setting mtime to
1970/01/01, but I had a feeling that earlier we were bitten by
non-portability of "touch" and introduced test-chmtime.

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