Friday, 6 October 1867 was followed by Friday, 18 October.
Instead of 12 days, only 11 were skipped, and the day of the week was repeated on successive days, because at the same time the International Date Line was moved, from following Alaska's eastern border with Canada to following its new western border, now with Russia.
The Battle of the Boyne was commemorated with smaller parades on 1 July.
However, the two events were combined in the late 18th century, and continue to be celebrated into modern times as "The Twelfth".
Usually, the mapping of new dates onto old dates with a start of year adjustment works well with little confusion for events which happened before the introduction of the Gregorian calendar.
Some more modern sources, often more academic ones, also use the "1661/62" style for the period between 1 January and 25 March for years before the introduction of the Gregorian calendar in England. and the British Calendar (New Style) Act 1750, Ireland, Great Britain and the British Empire (including much of what is now the eastern part of the United States) adopted the Gregorian calendar in 1752, by which time it was necessary to correct by 11 days.The consequence was that the basis for calculation of the date of Easter as decided in the fourth century had drifted from reality. In the case of Eastern Europe, for example, all of these assumptions would be incorrect.The Gregorian calendar reform also dealt with the accumulated difference between these figures, between the years 3 (1752 in the British Empire), by skipping 10 dates (11 in the case of Great Britain, including her colonies and Ireland) to restore the date of the vernal equinox to approximately March 21, the approximate date it occurred at the time of the First Council of Nicea in 325. In Scotland, the legal start of the year had already been moved to 1 January (in 1600), but Scotland otherwise continued to use the Julian calendar until 1752. But the start of the Julian year was not always 1 January, and was altered at different times in different countries (see New Year's Day in the Julian calendar). This was 25 March in England, Wales and the Colonies until 1752.From 1155 to 1752, the civil or legal year in England began on 25 March (Lady Day) The corresponding date in the Gregorian calendar is 9 February 1649, the date by which his contemporaries in some parts of continental Europe would have recorded his execution. During the years between the first introduction of the Gregorian calendar in continental Europe and its introduction in Britain, contemporary usage in England started to change.