CREATE TABLE table_5154 ("Player" TEXT, "Country" TEXT, "Major" TEXT, "Date" TEXT, "To par" TEXT, "Finish" TEXT)

On what Date was The Open Championship in Japan?
SELECT "Date" FROM table_5154 WHERE "Major" = 'the open championship' AND "Country" = 'japan'
SELECT "Date" FROM "table_5154" WHERE "Country" = 'japan' AND "Major" = 'the open championship'