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The TimeZoneOffset Exif tag was proposed as an ISO photography standard several years ago but never made it into the EXIF standard or MWG guidelines.

I can write data to this tag using exiftool and exiv2, but other than these tools, I'm not aware of any photo management applications or programs — on any platform — which actually make use of the TimeZoneOffset Exif tag. Is there any possibility that this or a similar standard will make it into widespread use?

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    What is the problem you are trying to solve? Need some context here. I assume you mean apps that control a phone camera and write exif information, as opposed to apps that read and use the information? – MikeW Apr 23 '15 at 19:28
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    Guys, don't be so pedantic. The word apps can be read and understood as an abbreviation of the word application or program. As for an EXIF tag having nothing to do with photography ... ¿¿¿¿ ???? – asp Apr 23 '15 at 23:15
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    asp - I don't see how this fits into our "on-topic" list, do you? Sure an EXIF tag is used in photography, we know that. But what are you trying to achieve with this Q&A? If the answer to this question ends up being "Yes, software XYZ" then what will you do with that information? How will it be applied to capturing/editing/techniques of photography and not programming per say? This was closed as unclear for those reasons I believe. – dpollitt Apr 24 '15 at 1:27
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    "techniques and best practices" – asp Apr 24 '15 at 11:02
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    I've attempted an edit — maybe this will help. An alternate approach might be: Is there a best practice for storing timezone information in metadata? And that basically comes down to existing question What do you do with your camera clock time in relation to time zones? – mattdm Apr 26 '15 at 13:51
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I don't think any significant software which uses this. The EXIF standard is to assume that the time zone matches the correct one for the location where the photo was taken.

Most cameras have ad hoc non-standard tags for dealing with this; for example, my Pentax camera sets World Time Location.

However, EXIF isn't all there is, and in fact I think most modern software instead concentrates on XMP, created by Adobe but now an ISO standard. Most relevantly, XMP has always included timezone as part of the specification. So, my advice would be to concentrate on that.

  • MWG specification suggests to prefer EXIF block when reading technical information, like camera Model, Lens,... Plus camera and image parameter specific info that is stored in EXIF:MakerNote block is not supported by XMP. – Murat - Daminion Software Apr 26 '15 at 14:48
  • @Murat Does that include time information? Does Daminion do anything with the non-standard EXIF TimeZoneOffset tag, or do you use the MakerNote info, or something else? – mattdm Apr 26 '15 at 15:20
  • This is why we can't have nice things. – deltaray Jan 4 at 3:20
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@mattdm: According to the MWG specification any handling of metadata dates (Original DateTime, Digitized DateTime, DateTime) SHOULD cause both XMP and EXIF to be updated.

But handling metadata properly in most case is a nightmare, mainly because there are a lot of vendors who don't follow official specifications when writing metadata.

Daminion doesn't take into account the EXIF TimeZoneOffset tag, but take into account the XMP time zone info, because the XMP specification formats date/time values according to the Date and Time (W3C) document. In this standard, a time zone designator is required if any time information is present. So if XMP block is existed in an image along with the time information you can extract the time zone info from XMP. If XMP block is not existed and non-standard EXIF TimeZone info is missed you can try to locate TimeZone in EXIF:GPS block.

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