Board Thread:Poll Archive/@comment-35301431-20141227205446/@comment-11582536-20151229235224

Most of the time, a Vocaloid's birthday is their release date. Some characters like Iroha and Zunko don't, though. :P

Kiyoteru's birthday was made official after he released but it's probably because he released on December 4th that they just made it his birthday too. His birthday could also be January 31 if you want to go by the ICE MOUNTAIN novel but no one cares about the novel

(Miki/Yuki/Kiyoteru were released on December 4th. By November 13th, you were probavly thinking about the date they were announced o:)

If a Vocaloid doesn't have a set birthday though, then it's their release date. C: