CREATE TABLE table_50825 ("Date" TEXT, "Tournament" TEXT, "Winning score" TEXT, "Margin of victory" TEXT, "Runner ( s ) -up" TEXT)

What is the date of the U.S. Women's open?
SELECT "Date" FROM table_50825 WHERE "Tournament" = 'u.s. women''s open'
SELECT "Date" FROM "table_50825" WHERE "Tournament" = 'u.s. women\'s open'