Marvel fans are reminiscing on Avengers: Endgame as real-time has finally caught up with the events in the movie. Though it came out in 2019, Endgame takes place in 2023, five years after Thanos' deadly Snap. Fans have deduced that Black Widow met her demise on October 16th, 2023 with the final battle sequence and Iron Man's death following on October 17th.
Source:https://www.cbr.com/avengers-endgame-saddest-moments/