Course add/drop

<p>It says course/add drop begins Friday Jan 18 for Freshman on student center, does anyone know what time exactly? Midnight or in the morning around 7 AM? Also is there an efficient way to drop and then add a class quickly. Meaning I want to add a class, but I already have another class at that time, but I'm willing to drop that class. Would I still be able to add the class and will they then give me the option of dropping the class I pre-enrolled for at at time, or would it just not work? Or could I do both tasks at once by utilizing the edit or swap feature, or is this also not a possibility?</p>

<p>Thanks</p>

<p>Edit: I think adding it with having another class at that time will generate an error as implied by this site: <a href="http://registrar.sas.cornell.edu/Student/enroll-FAQ.html#swap%5B/url%5D"&gt;http://registrar.sas.cornell.edu/Student/enroll-FAQ.html#swap&lt;/a&gt;&lt;/p>

<p>The swap feature in the example offered in the site seems to be for different components of the same class, but I'm not sure what the "edit" feature in student center does.</p>