Regnal years of English monarchs Britain), from 1066 to the present day. These are official "de jure" dates, and may or may not coincide with whether a particular king had "de facto" power or not at that time. For example, as the Commonwealth era was suppressed in the official record, the regnal years of Charles II are measured from 30 January 1649 (the day his father Charles I was executed); as a result, when Charles II actually became king, on 29 May 1660, he was already in his 12th regnal year. (For the "de facto" tabulation of English rulers, see any conventional list of English
Duration of English Parliaments before 1660 where necessary. It should be noted that old style dates would be a year earlier than the new style for days between 1 January and 24 March. No attempt has been made to compensate for the eleven days which did not occur in September 1752 in both England and Scotland, when the day after 2 September was 14 September), so as to bring the dating in Great Britain and its associated territories fully into line with the Gregorian calendar. Notes: - Notes:- Notes:- Duration of English Parliaments before 1660 This article augments the List of Parliaments of England to be