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