Diaries are used by many people in all walks of life for both personal and professional purposes. 

They are often put forward in court cases as evidence supporting a person's alleged version of events at a particular date and time.  Their date of preparation is, therefore, frequently called into question.

A detailed study of the disputed entries using microscopy, photoanalytical and electrostatic forensic document examination techniques often shows that a suspect entry or entries could not have been made as part of an ongoing contemporaneous record.

Related case studies: 

Diary entry addition

A case was submitted which required determining whether an entry in a diary that read "Meeting 2pm Signing Wend" (sic) was all written sequentially on the one occasion.