Does the novel War and Peace use dates from the Julian Calendar?
For exampe, chapter 19 begins:
"On the twenty-fourth of August the battle of the Shevardino
Redoubt was fought, on the twenty-fifth not a shot was fired by
either side, and on the twenty-sixth the battle of Borodino itself
But, the Battle of Borodino was fought on 7 September 1812.
This discrepancy is resolved if Tolstoy uses Julian dates:
26 Aug 1812 (Julian) = 7 Sep 1812 (Gregorian)