The "black" in Black Friday has a history extending back 70 years, but today it refers to two things: the black ink in ledger books as many retailers finally become profitable for the year, and the mourning by retail sales employees who lose a once-cherished day off from work. Now, hourly grunts are lucky if they have to work only on the day after Thanksgiving.Around 2011, large retailers started pushing Black Friday back to midnight, meaning their workers had to show up at about 11 p.m.