SD card Timestamp

[Clifford Snow]

Recently I've noticed that the file timestamp is 7 hours earlier than when
the file was created. This is happening on both an SD card I use in a
camera as well as my dashcam. Both the camera and the dashcam have been set
for the correct date and time. Neither gives me the option for entering the
timezone. It's not a big issue, but it's a hassle when looking for an image
or video taken around a particular time.

Looking at the Exif data on the dashcam video, it has recorded the correct
time to the exif data. But pulling up the sd card, the video time is 7
hours earlier.

Anyone have suggestions on how to fix this?

Thanks in advance,
Clifford

-- 
@osm_washington
www.snowandsnow.us
OpenStreetMap: Maps with a human touch

[Fulko Hew]

On Fri, Jul 23, 2021 at 8:28 PM Clifford Snow <clifford(a)snowandsnow.us&gt;
wrote:

>  Recently I've noticed that the file timestamp is 7 hours earlier
> than when
>  the file was created. This is happening on both an SD card I use in a
>  camera as well as my dashcam. Both the camera and the dashcam have been set
>  for the correct date and time. Neither gives me the option for entering the
>  timezone. It's not a big issue, but it's a hassle when looking for an image
>  or video taken around a particular time.
>
>  Looking at the Exif data on the dashcam video, it has recorded the correct
>  time to the exif data. But pulling up the sd card, the video time is 7
>  hours earlier.
>
>  Anyone have suggestions on how to fix this?
>  
Just a guess, but I would assume you set the clock on your camera to your
local time,
and the OS is assuming that time is UTC.   ... and you are 7 time zones
away from UTC.

[Clifford Snow]

On Fri, Jul 23, 2021 at 5:54 PM Fulko Hew <fulko.hew(a)gmail.com&gt; wrote:

>  On Fri, Jul 23, 2021 at 8:28 PM Clifford Snow <clifford(a)snowandsnow.us&gt;
>  wrote:
>
> > Recently I've noticed that the file timestamp is 7 hours earlier than
> > when the file was created. This is happening on both an SD card I use in a
> > camera as well as my dashcam. Both the camera and the dashcam have been set
> > for the correct date and time. Neither gives me the option for entering the
> > timezone. It's not a big issue, but it's a hassle when looking for an image
> > or video taken around a particular time.
> >
> > Looking at the Exif data on the dashcam video, it has recorded the
> > correct time to the exif data. But pulling up the sd card, the video time
> > is 7 hours earlier.
> >
> > Anyone have suggestions on how to fix this?
> >
>
>  Just a guess, but I would assume you set the clock on your camera to your
>  local time,
>  and the OS is assuming that time is UTC.   ... and you are 7 time zones
>  away from UTC.
>  pam on the list, report it: https://pagure.io/fedora-infrastructure
>  
The device was set for the local time with no options for timezone. What is
interesting is the dashcam file name includes the correct date and time,
but the file time is 7 hours earlier. And yes, I live 7 hours off of UTC.

For example a file with the filename of 2021_0771_131537_062.MP4 has a time
stamp of 7/21/2021 06:20 AM (Note the video is 5 minutes long so it would
have been written at 13:20 pm. )


-- 
@osm_washington
www.snowandsnow.us
OpenStreetMap: Maps with a human touch

[Joe Zeff]

On 7/23/21 8:20 PM, Clifford Snow wrote:
>  The device was set for the local time with no options for timezone.
> What 
>  is interesting is the dashcam file name includes the correct date and 
>  time, but the file time is 7 hours earlier. And yes, I live 7 hours off 
>  of UTC. 
Is your computer running on local time or UTC?

[Roberto Ragusa]

On 7/24/21 2:27 AM, Clifford Snow wrote:
>  Recently I've noticed that the file timestamp is 7 hours earlier
> than when the file was created. This is happening on both an SD card I use in a camera as
> well as my dashcam. Both the camera and the dashcam have been set for the correct date and
> time. Neither gives me the option for entering the timezone. It's not a big issue, but
> it's a hassle when looking for an image or video taken around a particular time.
>  
>  Looking at the Exif data on the dashcam video, it has recorded the correct time to the
> exif data. But pulling up the sd card, the video time is 7 hours earlier.
>  
>  Anyone have suggestions on how to fix this? 
Your SD card is probably FAT formatted
and FAT (coming from Windows) has no timezone concept, it timestamps
with local time.

Linux assumes by default that FAT timestamps are UTC (no other guess is reasonable).
But you can tell Linux that you know the timezone used on that card:
man mount and search for tz=UTC option in the vfat paragraph.

Regards.

-- 
    Roberto Ragusa    mail at robertoragusa.it