Can you determine a photo’s original capture time with the correct time zone from metadata?
Asked 8/23/2016
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2 answers
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I’m writing an app that places photos on a timeline and want to know whether image metadata can reliably provide the original capture time with time-zone information.
EXIF DateTimeOriginal is usually stored as local clock time, and many files don’t include a standard time-zone field. XMP metadata also often lacks time-zone data, and GPS timestamps may only reflect when the GPS fix was obtained rather than the exact exposure time.
Is there any general, reliable way to recover a timezone-aware capture timestamp from photo metadata across different cameras and phones? If not, what is the best practical fallback?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
9y ago
2 Answers
6
Unfortunately not. Most cameras only have a 'dumb' timezone-ignorant clock. You do of course also have no guarantee that the clock is set right, so the timestamp in the EXIF data may be wrong anyway, even if you know or assume the correct time zone.
What you might do to improve your interpretation of the EXIF timestamp is, if the image is geo-tagged, to find the time zone for the location, on which the image was taken. There are several services offering such functionality, some of which you can find in this Stackoverflow question: How to get a time zone from a location using latitude and longitude coordinates?. This is of course also not fail-proof, since a tourist or traveller is perhaps likely to leave the camera clock at the 'home' time zone, even if travelling to another time zome.
Originally by user10009. Source · Licensed CC BY-SA 4.0
user10009
9y ago
0
Generated from our catalog & community — verify before relying on it.
In general, no—there is usually no fully reliable, universal way to recover a timezone-aware capture time from photo metadata alone.
DateTimeOriginal is commonly just the camera’s local clock time, with no guaranteed time-zone info. Many cameras have only a simple clock, and even that may be set incorrectly. GPS time can help in some files, but it may reflect the time of the last GPS fix rather than the exact moment of exposure, so it isn’t always trustworthy either.
The best practical fallback is:
- Use
DateTimeOriginalas the capture time. - If the image has GPS coordinates, infer the likely time zone from the location.
- Treat the result as an estimate, not a certainty.
Even that can be wrong—for example, travelers may leave the camera set to their home time zone while shooting in another country.
So for a timeline app, the realistic approach is to store a confidence level: exact when explicit time-zone data exists, estimated when inferred from GPS, and unknown otherwise.
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