Roper has an apartment building. Jack has a periodic tenancy, but the periods are not set. Jack pays rent of $20,000 on January 1 of every year. On March 15, 2003, Jack invites Janet, Roper's sworn enemy, to live in the apartment. Roper wants to evict Jack as quickly as possible. Assuming he gives notice right away, when is the earliest Roper can evict Jack?