"There was peace and the world had an even tenor to it’s way. Nothing was revealed in the morning the trend of which was not known the night before. It seems to me that the disaster about to occur was the event that not only made the world rub it’s eyes and awake but woke it with a start keeping it moving at a rapidly accelerating pace ever since with less and less peace, satisfaction and happiness. To my mind the world of today awoke April 15th, 1912."
-Jack B. Thayer, Titanic Survivor
You mean this one?
(Apologies to whoever made it - this gif has been reposted so many times I have no clue who to credit…)
(The wreck was found in 1985).
Well, when Rose tells her story she says “It’s been 84 years” which would mean the modern day scenes are set in 1996. Brock says Rose is going to turn 101 the following month so that would mean Rose would have been born in 1895 making her 100 about to turn 101 in 1996.
We don’t know which month the modern day scenes are set in (Though we can presume they are not set in April as that probably would have been mentioned).
The movie was originally supposed to be released in the summer of 1996, and given what the characters are wearing at Rose’s house it looks unlikely to be winter and my guess is it would be May/June time. Which would mean Rose would have turned 17 in May/June 1911 and would have turned 18 after the sinking of the Titanic.