Differences Between Julian and Gregorian Dates
| Time period (from 1 March of first year to 28 February of last year) |
Сorrection, days |
|---|---|
| 1–100 | −2 |
| 100–200 | −1 |
| 200–300 | 0 |
| 300–500 | +1 |
| 500–600 | +2 |
| 600–700 | +3 |
| 700–900 | +4 |
| 900–1000 | +5 |
| 1000–1100 | +6 |
| 1100–1300 | +7 |
| 1300–1400 | +8 |
| 1400–1500 | +9 |
| 1500–1700 | +10 |
| 1700–1800 | +11 |
| 1800–1900 | +12 |
| 1900–2100 | +13 |
| 2100–2200 | +14 |
The Julian calendar was formerly in use in many European countries and their colonies, rather than the Gregorian calendar, currently in use in most countries. Consequently and to avoid ambiguity, "Old Style" (O.S.) and "New Style" (N.S.) are sometimes added to historical dates to identify which system is being used (when giving a date in the period when both systems were in parallel use). This notation is used in Western European (and colonial) history: similar notations are in use for the equivalent conversions in Eastern Europe and Asia.
For a period of 170 years (1582–1752), both dating systems were in concurrent use in different parts of Western Europe and its colonies. The Julian calendar had drifted by 11 days from the solar calendar (due to its excess of leap years), so dates differ between the systems. System conversion for secular use occurred in Eastern Orthodox countries as late as the 20th century, and has still not occurred for ecclesiastic use in some of these countries.
Catholic countries such as Italy, Poland, Spain, and Portugal were first to change to the Gregorian calendar. Thursday, 4 October 1582 was followed by Friday, 15 October 1582, with ten days "missing". Countries that did not change until the 18th century observed an additional leap year, necessitating eleven "missing days". Some countries did not change until the 19th or 20th century, necessitating one or two more "missing days".
France changed from Julian to Gregorian Calendar on 9 December 1582 (O.S.) where the next day was 20 December 1582 (N.S.). France used the French Republican Calendar from 22 September 1792 (N.S.) to 31 December 1805 (N.S.).
Ireland (under the provisions of the Calendar (New Style) Act 1750), Great Britain, and the British colonies changed from Julian to Gregorian Calendar at midnight on Wednesday 2 September 1752; the next day was Thursday 14 September 1752.
In Russia, the terms "Old Style" and "New Style" have the same significance as elsewhere. The start of the year was moved to 1 January in 1700, but the Gregorian calendar was introduced there much later, on 14 February 1918 (Gregorian calendar) in Soviet Russia (which became the Soviet Union in 1922). Hence the October Revolution of 1917 is so called, despite having started on 7 November under the Gregorian calendar (25 October ). Articles about the October Revolution which mention this date difference tend to do a full conversion to the dates from Julian to the Gregorian calendar. For example, in the article "The October (November) Revolution" the Encyclopædia Britannica uses the format of "25 October (7 November, New Style)" to describe the date of the start of the revolution.
It is sometimes remarked that William Shakespeare and Miguel de Cervantes died on the same date, 23 April 1616, but not on the same day. England was still using the Julian calendar in 1616, while Spain was using the Gregorian calendar. Cervantes actually died ten days before Shakespeare.
Read more about this topic: Old Style And New Style Dates
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