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The capture timestamps inside the photo's EXIF metadata (DateTime, DateTimeOriginal, DateTimeDigitized) are rewritten to your chosen time โ the same values gallery and photo apps sort by.
Photos with no EXIF record at all (screenshots, messenger downloads) can't get a new capture date, so only their file date changes. You'll see a notice after processing telling you how many were skipped.
Formats other than JPG/JPEG (HEIC, PNG, etc.) only get their file date changed โ their EXIF is not edited.
Photos are processed in browser memory only โ never uploaded. You can edit EXIF data of sensitive photos without them leaving your device.
A capture date can't be created where none exists, so only the file date is changed. After processing you'll see how many of the photos had no EXIF timestamp.
EXIF rewriting is supported for JPG/JPEG only. HEIC and PNG files get their file created/modified date changed, not the internal capture date.