(covers information from several alternate timelines)
Sunday was the first day of the Human week.
When Wesley Crusher came on board the USS Enterprise-D in 2370 and moved into his own quarters for the first time, he told his concerned mother, Doctor Beverly Crusher that he would visit her "in the old Doctor's Home every Sunday". (TNG: "Journey's End")
On a Sunday in late 2374 fell the one-month anniversary of Odo's first kiss with Major Kira Nerys. When he booked a holoprogram of the city of Paris circa 1928 for him and her, Quark thought he meant Saturday, which would have been the anniversary of their first date. (DS9: "The Sound of Her Voice")
In an alternate timeline in 2404, Admiral Kathryn Janeway made her regular visits to Tuvok at Starfleet Medical on Sundays. When she instead paid him a visit on a Thursday, he believed her to be an impostor, due to the degenerative neurological condition affecting his judgment. (VOY: "Endgame")
|The days of the Human week|
|Sunday • Monday • Tuesday • Wednesday • Thursday • Friday • Saturday|