DANSP28900 - Notices of decision: Date of issue
Regulation 4(2) of The Social Security Contributions (Decisions and Appeals) Regulations 1999 (SI 1999 No 1027)
The date of issue should be the date that the notice of decision is expected to leave the office and the same date that appears on any accompanying letters. It is also the date from which the 30 day appeal period runs, see ARTG2180. You only enter the date once. The SEES application automatically replicates the date on all parts of the DAA1.