Timetable Changes for Spring/Summer Opens April 24 Posted on April 15, 2024 at 12:10 pm. Full-time students may process timetable changes through MyDC beginning at 4:00 p.m. April 24, 2024 to May 10, 2024. ADD/DROP/SWAP How to Add Courses How to Drop Courses How to Swap Courses How to Add GNED’s