On Nadex, Trading days always start at 6:00pm ET, Sunday through Thursday. They continue without interruption until 5:00pm ET the following day, Monday through Thursday, and until 4:15:00pm ET on Friday.
|Monday||6:00pm ET Sunday||5:00pm ET Monday|
|Tuesday||6:00pm ET Monday||5:00pm ET Tuesday|
|Wednesday||6:00pm ET Tuesday||5:00pm ET Wednesday|
|Thursday||6:00pm ET Wednesday||5:00pm ET Thursday|
|Friday||6:00pm ET Thursday||4:15pm ET Friday|