Most sources uncritically repeat the information that he was born on 7 July 1887, without specifying whether this was a Gregorian or Julian date. However, this date is incorrect. He was born on 24 June 1887 under the then Julian calendar, which translates to 6 July 1887 in the Gregorian calendar, the gap between the calendars in 1887 being 12 days. Chagall himself miscalculated the Gregorian date when he arrived in Paris in 1910, using the then-current 13-day gap, not realising that this applied to births that occurred only from 1900 onwards. For further details, see Marc Chagall and His Times: A Documentary Narrative, p. 65.
