[Octave-bug-tracker] [bug #64933] Stat sometimes produces wrong timestamp

[Nicholas Jankowski]

Follow-up Comment #11, bug #64933 (project octave):

my local is USA,so those times correspond with the dst shift here.  see
https://en.wikipedia.org/wiki/Daylight_saving_time_by_country

in both cases I created the new file in the time before the change then
checked the stat results before & after the change.

In hindsight, though, as i was choosing times _just_ before the change so that
I could quickly do before/after, the november change occurs during the time
where you roll back and repeat an hour and that might have obscured the
issue.

here i changed time back to the summer, created an new file, then returned to
present time.  You can see that there is a discrepancy with the
stat(<filename>) return for after returning to normal time.

at time of file creation (July 1 2023):


>> time
ans = 1688215020.935662

>> stat('testfilesummer.txt')
ans =

  scalar structure containing the fields:

    dev = 2
    ino = 0
    mode = 33206
    modestr = -rw-rw-rw-
    nlink = 1
    uid = 0
    gid = 0
    rdev = 2
    size = 0
    atime = 1688214989
    mtime = 1688214989
    ctime = 1688214989
    blksize = NaN
    blocks = NaN

>> stat(fopen('testfilesummer.txt'))
ans =

  scalar structure containing the fields:

    dev = 0
    ino = 0
    mode = 33206
    modestr = -rw-rw-rw-
    nlink = 1
    uid = 0
    gid = 0
    rdev = 0
    size = 0
    atime = 1688214989
    mtime = 1688214989
    ctime = 1688214989
    blksize = NaN
    blocks = NaN


after return to correct time (nov 28 2023)


>> time
ans = 1701178973.715555
>> stat('testfilesummer.txt')
ans =

  scalar structure containing the fields:

    dev = 2
    ino = 0
    mode = 33206
    modestr = -rw-rw-rw-
    nlink = 1
    uid = 0
    gid = 0
    rdev = 2
    size = 0
    atime = 1688211389
    mtime = 1688211389
    ctime = 1688211389
    blksize = NaN
    blocks = NaN

>> stat(fopen('testfilesummer.txt'))
ans =

  scalar structure containing the fields:

    dev = 0
    ino = 0
    mode = 33206
    modestr = -rw-rw-rw-
    nlink = 1
    uid = 0
    gid = 0
    rdev = 0
    size = 0
    atime = 1688214989
    mtime = 1688214989
    ctime = 1688214989
    blksize = NaN
    blocks = NaN




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