Images captured with digital cameras include timestamp information that indicates date and time of capture, e.g., based on a date/time setting in the camera. However, such information excludes the time zone in which the image was captured. Consequently, a true time of capture, e.g., UTC (Universal Coordinated Time) of images captured with such cameras is unknown. For example, for a camera that is set to Pacific Standard Time (PST) while capturing images in New York, the images would include a timestamp that is offset from a New York local time by three hours. This disclosure describes techniques to analyze images to determine the time-offset, e.g., from UTC, of a camera used to capture the images. Once the time-offset from UTC is determined for a camera, timestamps of other images captured with the camera can be corrected, even for those images that have no discernable location information.
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Pack, Jeremy, "Automatic Image Timestamp Correction", Technical Disclosure Commons, (November 14, 2016)