Which Date has a Ship of hallbjorg?
CREATE TABLE table_55011 (
    "Date" text,
    "Ship" text,
    "Type" text,
    "Nationality" text,
    "Tonnage GRT" real
)
SELECT "Date" FROM table_55011 WHERE "Ship" = 'hallbjorg'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Which Date has a Ship of hallbjorg? ### Input: CREATE TABLE table_55011 (
    "Date" text,
    "Ship" text,
    "Type" text,
    "Nationality" text,
    "Tonnage GRT" real
) ### Response: SELECT "Date" FROM table_55011 WHERE "Ship" = 'hallbjorg'