strange shift day bug

[minipai]

There is a strange bug when I try to shift datetime. The command I ran is

exiftool "-AllDates+=2:11:27 16:10:00" "-FileModifyDate+=2:11:27 16:10:00" .

the result will be different when there is a different file combination in the folder
please see screenshot

this is the expected result


the result is wrong when added another file to batch



however, I workarounded with

exiftool "-AllDates+=1095 16:10:00" "-FileModifyDate+=1095 16:10:00" .

the files that cause the problem can be download from https://www.dropbox.com/s/fn04y3kjzkr36o2/Archive.zip?dl=0

version: MacOS Package: ExifTool-12.21.dmg (3.0 MB)

[Phil Harvey]

This is intentional.  Read here.

I'm guessing that your test case is purely hypothetical, because it isn't likely that anyone would really want to shift date/times like this.

- Phil

[minipai]

Thanks for your reply
After reading the "TRICKY" section I understand now.

The test case is real but simplified.

There were around 400 pics in my sd card's folder which time span for months.
I took a new photo (which will be the last photo in the folder) to find out how much I need to shift the whole folder, which the tool gave me the format starting with years.
Then found out if I apply to the whole folder the result would be different.

[Phil Harvey]

It would work if you shifted the test photo first. ie)

exiftool .... test_photo.jpg DIR

- Phil