When you were promoted to Reader the grade was Ac4 and the information recorded on the database is date to job title (ie. the date you were promoted to Reader). Date to grade is recorded as November 2019 (ie. when the Reader grade was revised to Ac5). Should you wish, you can insert the following in your Cover Letter: “although date to grade is listed as November 2019 when Readers were moved onto the new Ac5 grade, I was promoted to Reader on dd/mm/yyyy when it was Ac4”.