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Thread: Date/Time Stamp on Photos

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    Default Date/Time Stamp on Photos <SOLVED>

    I have a Canon EOS 1000D camera. I have set date and time to local time yet every picture I have taken is timestamped in UTC which is bloody confusing. Anyone know why/how this happens? It's a pain in the pooh pooh but now I'm going to have to set the time 9.5 hours ahead to just get a meaningful timestamp on my piccies.
    Last edited by lsemmens; 03-11-20 at 10:27 PM. Reason: problem solved
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    I don't know about that model, but most cameras have a country/time zone setting in the menu.

    Perhaps it's defaulting as it's not set to Australia?

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    Already checked all that out mate, all seems to be good.
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    Have you set the local time zone so it can offset the UTC to local time?
    Ah OK, I see already checked, seems odd that it doesn't use your time zone time stamp.
    Last edited by Tiny; 03-11-20 at 09:51 AM.
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    Some Canon models of this era have a secondary battery in them for date/time preservation -- if that's buggered, they do this

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    It retains the set time correctly, so I suspect that that battery is ok.
    Does anyone know of a utility where I can bulk modify the date/time stamp on images?
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    jhead or exiftool

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    Quote Originally Posted by lsemmens View Post
    It retains the set time correctly, so I suspect that that battery is ok.
    Does anyone know of a utility where I can bulk modify the date/time stamp on images?
    Irfanview can batch process & alter Time & Date EXIF data & file date.
    To overwrite the image stamp you would have to manually alter the image. I could be wrong, however i don't see any other way.

    Last edited by Tiny; 03-11-20 at 10:40 AM.
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    Back to your camera TIME Zone settings, I don't have the same model as you, however I just had a look in my Canon SX150 under Time Zone settings & it has 2 choices, Home or World, I suspect if set to world it will show as UTC.
    Cheers, Tiny
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    To overwrite the image stamp you would have to manually alter the image. I could be wrong, however i don't see any other way.
    Yep, you're wrong All that's happening is you're modifying the EXIF data in the header of the jpeg file - the device software (whatever device) is responsible for extracting the EXIF data, and overlaying that on the displayed image data -- changing the EXIF data does not alter the raw image data in any way.

    It retains the set time correctly, so I suspect that that battery is ok.
    Does it retain setting with the main battery disconnected?


    The jhead utility is my favourite, because you can just cd into the directory holding the images, and just issue a single command..ie;
    Code:
    jhead -ds2020:11:02 *.jpg
    Sets the EXIF date of all files in the directory to ... yesterday =) This is hardy, because many digital cameras increment the directory name of a per day basis (regardless) ..or you can do;

    Code:
    jhead -ts2020:11:02-10:10:30 *.jpg
    ..which sets date&time of all files
    Last edited by wotnot; 03-11-20 at 11:11 AM.

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    Yes it retains correct time with the battery disconnected. jhead looks promising, given that there is also a tarball. (I use Linux and was dreading having to install wingewoes just to fix a few (hundred) headers.
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    Quote Originally Posted by lsemmens View Post
    Yes it retains correct time with the battery disconnected. jhead looks promising, given that there is also a tarball. (I use Linux and was dreading having to install wingewoes just to fix a few (hundred) headers.
    Uh-huh, 2ndary battery must be working... sudo apt install jhead

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    Did not need sudo 'twas in the repositories!
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    Quote Originally Posted by wotnot View Post
    Yep, you're wrong All that's happening is you're modifying the EXIF data in the header of the jpeg file - the device software (whatever device) is responsible for extracting the EXIF data, and overlaying that on the displayed image data -- changing the EXIF data does not alter the raw image data in any way.
    I just tested this & the image overlay of the date stamp does not change, header info & EXIF info all changes, but not the image stamp red arrow image 2.





    So do you need to do this to the file on the camera first?
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    Quote Originally Posted by Tiny View Post
    I just tested this & the image overlay of the date stamp does not change, header info & EXIF info all changes, but not the image stamp red arrow image 2.

    So do you need to do this to the file on the camera first?
    My apologies Tiny ~ I see what you mean now =) If the camera is 'watermarking' the jpeg image data with a date/time stamp, then yes, you're correct ~ you would need to alter the image itself (this is not related to EXIF data =) My bad.

    @lsemmens -- you're probably referring to the same thing =^/

    IMHO (and a lot of photographers agree) doing this is the single simplest way to despoil an otherwise 'perfect picture' , so I/we leave the date/time stamping OFF so as to preserve the image integrity (plus it's somewhat redundant, considering the exif data already has this covered)

    Sorry for the confusion

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    I discovered that the EXIF data was, in fact, there, and correct. The file managers that I was using NEMO and NAUTILUS both report some other date/time combo from somewhere, The EXIF data is reported under an extra tab in the file properties, just not as EXIF, which would have been logical. I'll flag this as Solved.
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    Quote Originally Posted by wotnot View Post
    My apologies Tiny ~ I see what you mean now =) If the camera is 'watermarking' the jpeg image data with a date/time stamp, then yes, you're correct ~ you would need to alter the image itself (this is not related to EXIF data =) My bad.

    @lsemmens -- you're probably referring to the same thing =^/

    IMHO (and a lot of photographers agree) doing this is the single simplest way to despoil an otherwise 'perfect picture' , so I/we leave the date/time stamping OFF so as to preserve the image integrity (plus it's somewhat redundant, considering the exif data already has this covered)

    Sorry for the confusion
    No worries mate, I easily confuse people.
    I don't actually use date & time stamp (water mark image) myself, however I was interested in testing this out, even though I thought it impossible.
    Cheers, Tiny
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    Quote Originally Posted by lsemmens View Post
    I discovered that the EXIF data was, in fact, there, and correct. The file managers that I was using NEMO and NAUTILUS both report some other date/time combo from somewhere, The EXIF data is reported under an extra tab in the file properties, just not as EXIF, which would have been logical. I'll flag this as Solved.
    Ah that's good, I didn't think Canon would do that to a camera interface.
    Odd that the file manager is converting back to UTC.
    Cheers, Tiny
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    Of course the image date watermark won't change, it's part of the image, just like the horse or the sky or grass is. Is the date of the file creation, as shown in properties, the date it was transferred to the computer?

    Edit: If I copy a select a file from my NAS, and drag and drop to my desktop I get the following

    Accessed: Wed 04 Nov 2020 10∶05∶12 AEDT
    Modified: Wed 31 Aug 2016 10∶36∶13 AEST
    Created: Wed 04 Nov 2020 10∶05∶11 AEDT

    Which is standard as the file copied from the NAS to the desktop is actually a new file. But the original was created in 2016, in the above example.
    Last edited by bob_m_54; 04-11-20 at 10:10 AM.

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    Quote Originally Posted by bob_m_54 View Post
    Of course the image date watermark won't change, it's part of the image, just like the horse or the sky or grass is.
    Which is exactly what I said in Post#8. wotnot misunderstood my post. No big deal & he apologised.
    Not many people do that. Kudos to him.
    I have no problems taking 2 minutes to test it out & prove it can't be done.

    As we all know; impossible is just a word for something that hasn't been done yet.
    Cheers, Tiny
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