offset_photo_timestamps.sh

#!/bin/bash
# This command can fix timezone offsets for Nikon D850 RAW photos.
# Other vendors may have different date/time metadata.

# the hours offset should be the difference in hours to add to the camera's time
HOURS_OFFSET=20:00:00
# this should be the location's actual TZ offset
NEW_OFFSET=+13:00

exiftool -ModifyDate+=$HOURS_OFFSET -CreateDate+=$HOURS_OFFSET -OffsetTime=$NEW_OFFSET -OffsetTimeOriginal=$NEW_OFFSET -OffsetTimeDigitized=$NEW_OFFSET -TimeZone=$NEW_OFFSET -DateTimeOriginal+=$HOURS_OFFSET -overwrite_original *.NEF