Re: [9front] time info of dos file

[dave <dave@naffnet.org.uk>]

On 2023-11-24 11:27, 有澤健治 wrote:
> Hello
> 
> I have a trouble with mtime of dos files
> 
> Hera is my file server running on 9front.
> A dos file in usb disk is mounted on /n/dos.
> /n/dox/x and /tmp/x is touched at the same time.
> However my system shows different mtime.
> How to fix this problem?
> 
> 
> hera# touch /n/dos/x /tmp/x; ls -l /n/dos/x /tmp/x; date
> --rw-rw-rw- M 372782 bill    trog       0 Nov 25 03:48 /n/dos/x
> --rw-r--r-- M     24 arisawa arisawa 1051 Nov 24 18:48 /tmp/x
> Fri Nov 24 18:48:32 JST 2023
> hera#
> hera# mtime /n/dos/x; mtime /tmp/x
>  1700851712 /n/dos/x
>  1700819312 /tmp/x
> hera#
> 
> Ntote: date command shows Japanese local time.
> 
> Kenji Arisawa

FAT filesystems store the timestamp in local time 
(https://learn.microsoft.com/en-us/windows/win32/sysinfo/file-times) 
other things will store this in UTC

Thus  (1700851712 - 1700819312) / 3600 = 9 (Japan is UTC + 9)

Dave