Lady day dating
This article is about the 18th-century changes in calendar conventions used by Great Britain and its colonies, together with a brief explanation of usage of the term in other contexts. S.) are terms sometimes used with dates to indicate that the calendar convention used at the time described is different from that in use at the time the document was being written.For a more general discussion of the equivalent transitions in other countries, see Adoption of the Gregorian calendar. There were two calendar changes in Great Britain and its colonies, which may sometimes complicate matters: the first was to change the start of the year from Lady Day (25 March) to 1 January; the second was to discard the Julian calendar in favour of the Gregorian calendar.
For example, the Battle of Blenheim is always given as 13 August 1704.
In Russia, new style dates came into use in early 1918.
Other countries in Eastern Orthodoxy adopted new style dating for their civil calendars but most continue to use the Julian calendar for religious use. designation is particularly relevant for dates which fall between the start of the "historical year" (1 January) and the official start date, where different.
The 'start of year' change and the calendar system change were not always adopted concurrently.
Similarly, civil and religious adoption may not have happened at the same time (or even at all).