On Mac 14.5 Sonoma, you can use the peovoded SetFile command to set the added date (-d) or modified date with (-m). If the modified date is earlier than added date, then added date is set to modified date.
From the manual:
Usage: SetFile [option...] file...
-a attributes # attributes (lowercase = 0, uppercase = 1)*
-c creator # file creator
-d date # creation date (mm/dd/[yy]yy [hh:mm[:ss] [AM | PM]])*
-m date # modification date (mm/dd/[yy]yy [hh:mm[:ss] [AM | PM]])*
-P # perform action on symlink instead of following it
-t type # file type
Note: The following attributes may be used with the -a option:
A Alias file
B Bundle
C Custom icon*
D Desktop*
E Hidden extension*
I Inited*
M Shared (can run multiple times)
N No INIT resources
L Locked
S System (name locked)
T Stationery
V Invisible*
Z Busy*
Note: Items marked with an asterisk (*) are allowed with folders
Note: Period (.) represents the current date and time.
Note: [yy]yy < 100 assumes 21st century, e.g. 20yy
