To expand on the option suggested by @Ryan_Kinakr, editing the Samsung:TimeStamp tag should not be difficult to do in a hex editor. Make sure to use it on a test file, as I have not actually tested this to verify it works.
If you look at the file using exiftool's -v3 (-verbose3) option, you will see output similar to this for the Samsung trailer.
SamsungTrailer_0x0a01Name = Image_UTC_Data - Tag '0x0a01-name' (14 bytes): 3c8a6b: 49 6d 61 67 65 5f 55 54 43 5f 44 61 74 61 [Image_UTC_Data] TimeStamp = 1704333346492 - Tag '0x0a01' (13 bytes): 3c8a79: 31 37 30 34 33 33 33 33 34 36 34 39 32 [1704333346492] SamsungTrailer_0x0aa1Name = MCC_Data - Tag '0x0aa1-name' (8 bytes): 3c8a8e: 4d 43 43 5f 44 61 74 61 [MCC_Data] MCCData = 310 - Tag '0x0aa1' (3 bytes): 3c8a96: 33 31 30 [310] SamsungTrailer_0x0c61Name = Camera_Capture_Mode_Info - Tag '0x0c61-name' (24 bytes): 3c8aa1: 43 61 6d 65 72 61 5f 43 61 70 74 75 72 65 5f 4d [Camera_Capture_M] 3c8ab1: 6f 64 65 5f 49 6e 66 6f [ode_Info] SamsungTrailer_0x0c61 = 1 - Tag '0x0c61' (1 bytes): 3c8ab9: 31 The part to edit would be the [Image_UTC_Data] section. The thirteen bytes that make up the TimeStamp tag is simply the Unix time stamp for the set time. To edit it, you would need to figure out the Unix time stamp for the date/time you want to change it to, and overwrite that section with the new time stamp.
Note that when exiftool reads this tag, it converts it to the local time zone, so you will not be able to change the time zone that exiftool outputs. That value will always depend upon the locale set by the computer you are using.
