When was Kim Jong-un born?
He was born on Jan 8, 1983.
How accurate is this?
It's really only a rough guess based on Kim Jong-un's birth date and so this calculator should only be used for curiosity. An average gestation period of 38 weeks is used to calculate the conception date.
Where did you get this information come from?
We used http://en.wikipedia.org/wiki/Kim_Jong-un as a reference for Kim Jong-un's birth date and then calculated the conception date based on this.