He won a bronze medal at the 2011 World Youth Championships in Athletics.

[1] Days won his first National HS Shot Put title at the NBIN meet in New York, New York with a throw of 21.00m(5.45k) Days attended Bridgeton High School and was selected by The Press of Atlantic City as their Boys' Track and Field Athlete of the Year in 2011,[2] as well as Indoor Athlete of the Year 2012.

Days is the current American Junior Record holder in the shot put with a distance of 21.16 m (69 ft 5 in)(6k).

He placed tenth in shot put at 2016 NCAA Division I Indoor Track and Field Championships in 18.76 m (61 ft 6+1⁄2 in).

Days placed fifth in shot put at 2016 NCAA Division I Outdoor Track and Field Championships in 20.03 m (65 ft 8+1⁄2 in).