But given all of their other problems, they probably just assumed that -04:00 was EDT.) (Hopefully it was determined by cross-referencing the GPS location. This time zone abbreviation was acquired through some other means that is not specified. In this sample picture, there is nothing in the metadata identifying "EDT". It's EDT in the United States and Canada, EST in Jamaica, VET in Venezuela, BOT in Bolivia, etc. The problem is that "-04:00" is used in lots of countries. This metadata field isn't always present, but when it is, it identifies the time zone as a numeric value. For most cameras, the time is relative to the local time zone. The EXIF metadata includes two pieces of date-related information: The problem is that "EDT" is not specified anywhere in the picture's metadata. (Is it February 8th, or August 2nd?) Any kind of provenance service should use non-ambiguous date formats. These standards avoid any ambiguous cases, like "". International standards use YYYY-MM-DD and the EXIF standard uses YYYY:MM:DD.
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