I wouldn't change a thing. Maybe I would spend more time with family, But overall, We live every moment not knowing if it's our last moment, any of us here could be "extinct" in the next five minutes.
Knowing it was all coming to an end in 30 days, Would make the world into a train wreck shell of its former self, The world would become a dangerous place full of looters, Any criminal that had some sort of crime they never committed for X reason would do so in this time.
Killers would Kill, Stealers would steal, And no one anyone would be exercising any restraints, In those Thirty days, if you and your family weren't in some sort of underground vault you wouldn't even have thirty days before someone tried to harm you or your family. So, In those thirty days, I will be transporting goods and items like canned food and batteries to a little cave that I know about that's just big enough for about two families, And relocating there, because If all we have left is 30 days, I want peace in that time.