I calculated that the date shift I want to apply is "4:2:26 14:26:36" but the output of my script doesn't show any change to DateTimeOriginal being applied.
zCKAvid:EXIF-tags-from-.insp-into-jpeg charleskahn$ perl '/Users/charleskahn/Documents/GitHub/EXIF-tags-from-.insp-into-jpeg/exif_shift_date.pl'
=================== INSP files
Date/Time Original Camera CameraXX/FileName
before
2018:01:01 23:11:04 Insta360 One2 IMG_20180101_191104_00_218.insp
after
2018:01:01 23:11:04 Insta360 One2 IMG_20180101_191104_00_218.insp
zCKAvid:EXIF-tags-from-.insp-into-jpeg charleskahn$
https://github.com/chuckkahn/EXIF-tags-from-.insp-into-jpeg/blob/main/exif_shift_date.pl
Never mind. Fixed it.