Does anyone know the specific date or time when Pucci reset the universe? Or anything similar like the month and year it happened?
The universe has been reset at the singulary point, so infinity.
What you are looking for is probably when Pucci started speeding up the universe. That is March 21st, 2012, one day before the new moon on March 22nd, 2012.
It is written on the intro to Stone Ocean chapter 157 "Made in Heaven Part 9".