AUTHOR’S NOTE: THE RUSSIAN CALENDAR
When Pope Gregory XIII mandated the switch from the old Julian calendar to the astronomically more accurate reckoning of the Gregorian calendar in 1582, because of religious enmities neither Protestant nor Orthodox countries would follow suit. England and the British colonies in America did not switch over to the Gregorian calendar until 1752 (with the result that most of America’s Founding Fathers have two recorded birth dates, one ‘old-style’ and one Gregorian about eleven days later); Sweden did not make the change until 1753, and Russia did not start using the Gregorian calendar until after the 1918 Revolution that ended the rule of the Tsars. Thus, in 1911, when this story takes place, all dates are different depending on whether the action is taking place inside or outside of Russia, the Julian date being two weeks behind the Gregorian.
Greece did not switch to the Gregorian reckoning until 1924, and many Orthodox churches still use the Julian calendar to calculate the date of Easter.