When continental Europe converted from the Julian to the Gregorian calendar, the calendar was pushed ahead 10 days. In 1582, October 5 through October 14 simply vanished and never existed!
By the time anti-Papist Britain and its colonies adopted the Gregorian Calendar in 1752, it was an 11 day jump. (Which is why George Washington wasn't born on George Washington's birthday, February 22, 1732. In addition, the Julian year began in March, at least in Britain anyway.)
Russia did not adopt the Gregorian calendar until the Russian Revolution in 1918, (Which explains why the Soviets celebrated their "October Revolution" in November.)
Finally, the Eastern Orthodox church never adopted the Gregorian calendar.
So with these calendar changes - the Gregorian Calendar adoption dates - one can find find a short year using the so-called modern western calendar.
(From the dawn of civilization, many different cultures have developed many different calendars. Some calendars are/were solar based, others lunar based while some are/were a combination - eg: the Hebrew and Islamic calendars. The Mayans even included the morning star appearance cycle of Venus in their calendar.)