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Timezone

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  Timezone Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-05-28 00:50 +0200
    Re: Timezone Dan Ritter <dsr@randomstring.org> - 2021-05-28 01:00 +0200
      Re: Timezone Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-05-28 01:00 +0200

#235601 — Timezone

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Hi !
I'm using a camera that I access as a USB disk.
It appears as a FAT32 filesystem.
On my camera it uses the local time and timezone. It does so automatic
with the use of GPS / cell tower sync.
When I look at picture that I've just taken, they appear at a different
time.
Could this be caused by the system thinking the timestamp of my files
are UTC but my computer itself is local timezone ?
If so, is there's a way to fix this so I get see the correct time
displayed when I list the files ? For example to add 6 hours to this
filesystem timestamp ?

-- 
Polyna-Maude R.-Summerside
-Be smart, Be wise, Support opensource development

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#235602

Polyna-Maude Racicot-Summerside wrote: 
> Hi !
> I'm using a camera that I access as a USB disk.
> It appears as a FAT32 filesystem.
> On my camera it uses the local time and timezone. It does so automatic
> with the use of GPS / cell tower sync.
> When I look at picture that I've just taken, they appear at a different
> time.
> Could this be caused by the system thinking the timestamp of my files
> are UTC but my computer itself is local timezone ?
> If so, is there's a way to fix this so I get see the correct time
> displayed when I list the files ? For example to add 6 hours to this
> filesystem timestamp ?
> 

man 8 mount says, under FAT-specific options:

tz=UTC This option disables the conversion of timestamps between
       local time  (as  used  by Windows on FAT) and UTC (which Linux uses
       internally).  This is particularly useful when mounting devices (like
       digital cameras) that are set to UTC in order to  avoid the pitfalls
       of local time.

time_offset=minutes Set  offset for conversion of timestamps from
       local time used by FAT to UTC.  I.e., minutes will be subtracted
       from each timestamp to convert it to UTC used internally by
       Linux.  This is useful when the time zone set in the kernel via
       settimeofday(2) is not the time zone used by the filesystem.
       Note that this option still does  not provide  correct  time
       stamps  in  all cases in presence of DST - time stamps in a
       different DST setting will be off by one hour.

-dsr-

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#235603

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Hi,

On 2021-05-27 6:53 p.m., Dan Ritter wrote:
> Polyna-Maude Racicot-Summerside wrote: 
>> Hi !
>> I'm using a camera that I access as a USB disk.
>> It appears as a FAT32 filesystem.
>> On my camera it uses the local time and timezone. It does so automatic
>> with the use of GPS / cell tower sync.
>> When I look at picture that I've just taken, they appear at a different
>> time.
>> Could this be caused by the system thinking the timestamp of my files
>> are UTC but my computer itself is local timezone ?
>> If so, is there's a way to fix this so I get see the correct time
>> displayed when I list the files ? For example to add 6 hours to this
>> filesystem timestamp ?
>>
> 
> man 8 mount says, under FAT-specific options:
> 
> tz=UTC This option disables the conversion of timestamps between
>        local time  (as  used  by Windows on FAT) and UTC (which Linux uses
>        internally).  This is particularly useful when mounting devices (like
>        digital cameras) that are set to UTC in order to  avoid the pitfalls
>        of local time.
> 
> time_offset=minutes Set  offset for conversion of timestamps from
>        local time used by FAT to UTC.  I.e., minutes will be subtracted
>        from each timestamp to convert it to UTC used internally by
>        Linux.  This is useful when the time zone set in the kernel via
>        settimeofday(2) is not the time zone used by the filesystem.
>        Note that this option still does  not provide  correct  time
>        stamps  in  all cases in presence of DST - time stamps in a
>        different DST setting will be off by one hour.
> 
> -dsr-
> 

Really big sorry to have made you lookup the man pages !
I shall have did a better look up myself.

Thanks
-- 
Polyna-Maude R.-Summerside
-Be smart, Be wise, Support opensource development

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