How To Add Days And Time For Instructor Schedule
Try making the instructor_course table like this

CREATE TABLE instructor_course (
    InstructorCourseID int IDENTITY (1,1) CONSTRAINT pk_instructor_course PRIMARY KEY CLUSTERED NOT NULL,
    DayName char(10) NOT NULL,
    CourseID int CONSTRAINT fk_CourseID_instructor_course REFERENCES Course(CourseID) NOT NULL,
    InstructorID ...
    StartTime time NOT NULL,
    EndTime time NOT NULL,
    StartDate date NOT NULL,
    EndDate date NULL);


Then you could also add some constraint to the table if you want to enforce a rule that two courses can't be timetabled at the same time. If a course has multiple sessions during the week each will be a row in this table.