Check out XL Help "About viewing changes and resolving conflicts in a
shared workbook", specifically about using a History Sheet.

Note that it's not foolproof, but it's novice-proof.

In article ,
arrivarob wrote:

Im trying to set up a shared document in Excel which will allow me then to
record the date and time that those sharing it have added information, this
needs to be done in a way which cannot be tampered with