Original: When describing cricket seasons, the convention used is that a single year represents an English cricket season, while two years (e.g. 1933 - 34) represent a southern hemisphere cricket season because it takes place over two calendar years (e.g. September to February).
Simplified: Douglas Robert Jardine (Born 23 October 1900 - Died 18 June 1958) used to play cricket for England and was captain from 1931 to 1933-34.