Extension of GST anti profiteering compliance deadlines - deadlines extended and notification made retroactively effective until end of March. Amendment of a state GST notification substitutes earlier date references in the proviso to clause (i) with later March dates, thereby extending the due dates for anti profiteering compliances and actions; the notification is deemed issued on a stated December date and deemed to have come into force from the first day of that month, making the date substitutions retroactively effective.