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-== Julian and Gregorian Calendars
-
-The difference between the
-{Julian calendar}[https://en.wikipedia.org/wiki/Julian_calendar]
-and the
-{Gregorian calendar}[https://en.wikipedia.org/wiki/Gregorian_calendar]
-may matter to your program if it uses dates before the switchovers.
-
-- October 15, 1582.
-- September 14, 1752.
-
-A date will be different in the two calendars, in general.
-
-=== Different switchover dates
-
-The reasons for the difference are religious/political histories.
-
-- On October 15, 1582, several countries changed
-  from the Julian calendar to the Gregorian calendar;
-  these included Italy, Poland, Portugal, and Spain.
-  Other countries in the Western world retained the Julian calendar.
-- On September 14, 1752, most of the British empire
-  changed from the Julian calendar to the Gregorian calendar.
-
-When your code uses a date before these switchover dates,
-it will matter whether it considers the switchover date
-to be the earlier date or the later date (or neither).
-
-See also {a concrete example here}[rdoc-ref:DateTime@When+should+you+use+DateTime+and+when+should+you+use+Time-3F].
-
-=== Argument +start+
-
-Certain methods in class \Date handle differences in the
-{Julian and Gregorian calendars}[rdoc-ref:date/calendars.rdoc@Julian+and+Gregorian+Calendars]
-by accepting an optional argument +start+, whose value may be:
-
-- Date::ITALY (the default): the created date is Julian
-  if before October 15, 1582, Gregorian otherwise:
-
-      d = Date.new(1582, 10, 15)
-      d.prev_day.julian? # => true
-      d.julian?          # => false
-      d.gregorian?       # => true
-
-- Date::ENGLAND: the created date is Julian if before September 14, 1752,
-  Gregorian otherwise:
-
-    d = Date.new(1752, 9, 14, Date::ENGLAND)
-    d.prev_day.julian? # => true
-    d.julian?          # => false
-    d.gregorian?       # => true
-
-- Date::JULIAN: the created date is Julian regardless of its value:
-
-    d = Date.new(1582, 10, 15, Date::JULIAN)
-    d.julian? # => true
-
-- Date::GREGORIAN: the created date is Gregorian regardless of its value:
-
-    d = Date.new(1752, 9, 14, Date::GREGORIAN)
-    d.prev_day.gregorian? # => true
-