Translate the following question to SQL: Find the the date of enrollment of the "Spanish" course.

Schema: CREATE TABLE Course_Authors_and_Tutors (
    author_id INTEGER   PRIMARY KEY,
    author_tutor_ATB VARCHAR(3),
    login_name VARCHAR(40),
    password VARCHAR(40),
    personal_name VARCHAR(80),
    middle_name VARCHAR(80),
    family_name VARCHAR(80),
    gender_mf VARCHAR(1),
    address_line_1 VARCHAR(80)
);

CREATE TABLE Students (
    student_id INTEGER   PRIMARY KEY,
    date_of_registration DATETIME,
    date_of_latest_logon DATETIME,
    login_name VARCHAR(40),
    password VARCHAR(10),
    personal_name VARCHAR(40),
    middle_name VARCHAR(40),
    family_name VARCHAR(40)
);

CREATE TABLE Subjects (
    subject_id INTEGER   PRIMARY KEY,
    subject_name VARCHAR(120)
);

CREATE TABLE Courses (
    course_id INTEGER   PRIMARY KEY,
    author_id INTEGER NOT NULL,
    subject_id INTEGER NOT NULL,
    course_name VARCHAR(120),
    course_description VARCHAR(255),
    FOREIGN KEY (subject_id) REFERENCES Subjects(subject_id),
    FOREIGN KEY (author_id) REFERENCES Course_Authors_and_Tutors(author_id)
);

CREATE TABLE Student_Course_Enrolment (
    registration_id INTEGER   PRIMARY KEY,
    student_id INTEGER NOT NULL,
    course_id INTEGER NOT NULL,
    date_of_enrolment DATETIME NOT NULL,
    date_of_completion DATETIME NOT NULL,
    FOREIGN KEY (student_id) REFERENCES Students(student_id),
    FOREIGN KEY (course_id) REFERENCES Courses(course_id)
);

CREATE TABLE Student_Tests_Taken (
    registration_id INTEGER NOT NULL,
    date_test_taken DATETIME NOT NULL,
    test_result VARCHAR(255),
    FOREIGN KEY (registration_id) REFERENCES Student_Course_Enrolment(registration_id)
);
user
SELECT T2.date_of_enrolment FROM Courses AS T1 JOIN Student_Course_Enrolment AS T2 ON T1.course_id  =  T2.course_id WHERE T1.course_name  =  "Spanish"
assistant