CREATE TABLE table_55911 ("Date" TEXT, "Name" TEXT, "Flag" TEXT, "Tonnage  ( GRT ) " FLOAT, "Sunk by" TEXT)

What is the date for Zouave?
SELECT "Date" FROM table_55911 WHERE "Name" = 'zouave'
SELECT "Date" FROM "table_55911" WHERE "Name" = 'zouave'