So yea I'm just curious to see what people would do in such a scenario

Let's say the destruction of the earth is inevitable, there is absolutely nothing that can be done to save anything/anyone.
Ideally I would like people to consider separate variations of the same idea, like say the world is ending in 3 days, 1 month, 5 years, 20 years (Even in the case where world end is in 20 years, nothing can be done, no technological advancement/miracle will be able to save anyone). What will you do? How will your life change (if at all)?