Port Blair, Oct. 18: The public holiday declared vide Administration’s notification dated 20.07.2020 on the eve of ‘Prophet Mohammad’s Birthda (Milad-un-Nahi/ Id-e-Milad’ will be observed on 20th Oct. 2021 based on the sighting of moon instead of 19th October 2021 as informed by the Secretary, Andaman & Nicobar Hilal Committee, a press note issued by the A&N Administration today stated.