Indeed it could, not sure of the circumstances but I'm sure there must be one. If the patient expressed "irritation" with the doctor but is too incapacitated to make a complaint, perhaps you should help them or you could contact Pals, the patient liaison service to discuss the patient's options. Does he want the doctor barred from practising or just a slap on the wrist for writing the wrong the date? Perhaps a letter to the hospital's chair of the trust? I think it's important to establish the actual level of this junior doctor. Was he/she a foundation doctor or someone more senior, this could have important training implications ie at what level of training do doctors learn about "how to ensure they write the correct date". Or perhaps it was just a mistake made by a busy doctor or more likely a nurse who completed the form and asked the doctor to check the details and sign it as correct. Who knows but I think you need to get to the bottom of it.