Day's Olympiad appearances for Canada have spanned 30 years, from 1968 to 1998, according to the comprehensive Olympiad site olimpbase.org. In his later years, during the 1990s, he several times volunteered at the last minute to fill in for players who were unable to go because of unforeseen circumstances. Day played at Skopje 1972 as second reserve (+2,=5,-3); Nice 1974 as first reserve (+5,=5,-1); Haifa 1976 as second board (+2,=6,-2); Buenos Aires 1978 as third board (+6,=3,-2); La Valletta 1980 as second board (+5,=4,-2); Lucerne 1982 as fourth board (+5,=2,-5); Thessaloniki 1984 as third board (+3,=5,-2); Dubai 1986 as third board (+8,=0,-3), winning the bronze medal; Manila 1992 as first reserve (+0,=2,-4); Moscow 1994 as fourth board (+3,=3,-3); Yerevan 1996 as first reserve (+6,=3,-2); and finally at Elista 1998 as first reserve (+3,=0,-4). His totals for Canada in Olympiad play are: +51,=39,-41, in a total of 131 games, which is the second most by a Canadian, behind only Daniel Yanofsky's 141. Canada made its best Olympiad results so far in 1976 with eighth place, eleventh place in 1978, and ninth place in 1980, and Day was a strong contributor all three times.