On 2021-04-14 04:36, akiki--- via Cygwin wrote:
I encountered problems with the use of timestamps in cygwin.
May be it's an old problem, I don't know, using essentially files "recently"
created/modified.
I want to say after 1970 No problem, but before ...
To day:
touch -m -t 190001011200.00 x gives touch: format de date « 190001011200.00 »
incorrect
touch -m -t 190101011200.00 x gives ok - with ls -l x:
-rw-r--r-- 1 user group 0 1 janv. 1910 x
touch used is well /bin/touch
By comparison on Ubuntu 18 LTS
touch -m -t 190001011200.00 x is correct
I know, timestamps are managed differently in windows and linux.
I see also with the new windows terminal with ubuntu
On windows file, like /mnt/c/x (windows is mounted by linux)
touch -m -t 190001011200.00 x ; echo $? gives
0 #No error but timestamp is set to 1970-01-01
On linux file as ~/x, it's correct;
So, which confidence to have with cygwin about files of timestamp 19xx before
1970.
May be it's ok after 1901. The answer is NOT.
touch -m -t 190101011200.00 x gives sometimes format de date incorrect
In some windows directories and more problematic, for a same directory, I don't
understand why.
May be due to embedded mounts.
I hope to have been clear enough.
What's your OS + version, Cygwin uname -srvmo, Windows filesystem (and
underlying if networked), time zone?
Please repeat touch tests, followed by ls -glo and --full-time if required.
I have timestamped some historical documents and images with no problems.
Works just fine for me on current Windows, Cygwin, NTFS back to Windows limits:
$ for ((y=1980;y>1580;y-=10)); do touch -t ${y}12312359.59 t && ls -glo t ||
echo $y; done
-rw-r--r--+ 1 1 Dec 31 1980 t
-rw-r--r--+ 1 1 Dec 31 1970 t
-rw-r--r--+ 1 1 Dec 31 1960 t
-rw-r--r--+ 1 1 Dec 31 1950 t
-rw-r--r--+ 1 1 Dec 31 1940 t
-rw-r--r--+ 1 1 Dec 31 1930 t
-rw-r--r--+ 1 1 Dec 31 1920 t
-rw-r--r--+ 1 1 Dec 31 1910 t
-rw-r--r--+ 1 1 Dec 31 1900 t
-rw-r--r--+ 1 1 Dec 31 1890 t
-rw-r--r--+ 1 1 Dec 31 1880 t
-rw-r--r--+ 1 1 Dec 31 1870 t
-rw-r--r--+ 1 1 Dec 31 1860 t
-rw-r--r--+ 1 1 Dec 31 1850 t
-rw-r--r--+ 1 1 Dec 31 1840 t
-rw-r--r--+ 1 1 Dec 31 1830 t
-rw-r--r--+ 1 1 Dec 31 1820 t
-rw-r--r--+ 1 1 Dec 31 1810 t
-rw-r--r--+ 1 1 Dec 31 1800 t
-rw-r--r--+ 1 1 Dec 31 1790 t
-rw-r--r--+ 1 1 Dec 31 1780 t
-rw-r--r--+ 1 1 Dec 31 1770 t
-rw-r--r--+ 1 1 Dec 31 1760 t
-rw-r--r--+ 1 1 Dec 31 1750 t
-rw-r--r--+ 1 1 Dec 31 1740 t
-rw-r--r--+ 1 1 Dec 31 1730 t
-rw-r--r--+ 1 1 Dec 31 1720 t
-rw-r--r--+ 1 1 Dec 31 1710 t
-rw-r--r--+ 1 1 Dec 31 1700 t
-rw-r--r--+ 1 1 Dec 31 1690 t
-rw-r--r--+ 1 1 Dec 31 1680 t
-rw-r--r--+ 1 1 Dec 31 1670 t
-rw-r--r--+ 1 1 Dec 31 1660 t
-rw-r--r--+ 1 1 Dec 31 1650 t
-rw-r--r--+ 1 1 Dec 31 1640 t
-rw-r--r--+ 1 1 Dec 31 1630 t
-rw-r--r--+ 1 1 Dec 31 1620 t
-rw-r--r--+ 1 1 Dec 31 1610 t
-rw-r--r--+ 1 1 Dec 31 1600 t
touch: setting times of 't': Invalid argument
1590
$ for ((y=1600;y>1598;--y)); do touch -t ${y}12312359.59 t && ls -glo t || echo
$y; done
-rw-r--r--+ 1 1 Dec 31 1600 t
touch: setting times of 't': Invalid argument
1599
$ y=1600; for ((m=12;m>10;--m)); do touch -t ${y}${m}312359.59 t && ls -glo t ||
echo $y-$m; done -rw-r--r--+ 1 1 Dec 31 1600 t
touch: invalid date format ‘160011312359.59’
1600-11
--
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada
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