Initially, the Derby was run on a Thursday in late May or early June, depending on when Easter occurred. In 1838 the race was moved to a Wednesday to fit in with the railways' timetables, but still followed the moveable feast of Easter. In the 20th century, the race was run on the first Wednesday in June from 1900 until 1995, not including 1915 to 1918 (during the First World War), when it was on a Tuesday. During the Second World War, from 1942 until 1945 the race was run on a Saturday, as it was in the post-war years of 1947 to 1950 and again in 1953. In 1995 the day was changed from the first Wednesday in June to the first Saturday, and since then all the races have taken place on that day.