In LA, the year is 2004
In that year, they show the Island submerged under water
But on the Island, its unknown which year it is…they had a timeshift from 1977 to some unknown..time in the future…could be the present 2010, or could be before 2004 and some events lead to the island being submerged under water…
So in summary:
They detonate the nuclear weapon in 1977, which propels them into an unknown date in the future. The Nuclear Weapon detonation prevents the French Scientist, Desmond from coming onto the Island. And thus we see Desmond on the plane with Jack. Jack saw Desmond training to sail around the world in that Stadium and that is where he recognizes him from.
What is unknown is Charles Widmore still looking for that Island?
And how did that Island end up under water?
by the way, I am still confused about the smoke monster…
Is the Smoke Monster the guy Jacob killed in the 17th century?
And how and why the heck did it take Locke’s form? And how does it know what Locke felt before he was strangled by Ben?
And by the way, did they ever answer as how the heck did Eko’s brother drug smuggling plane ended up on the Island?
And how did Jacob and Others end up on the Island? Are they people who shipwrecked on the Island and they don’t age which means that the Island prevents aging? But how can that be since Ben came onto the Island as a child and now is a grown man.