What day did Nyan Cat come out?

Excuse me, but I was wondering if you could possibly assist me with a small query. I've been trying to find out the exact date when the famous Nyan Cat meme was first released. I understand it's quite a popular and well-known internet phenomenon, but I'm having a bit of trouble pinpointing the specific day it debuted. Do you happen to know the answer to this question, or could you perhaps direct me to a reliable source where I might find the information I'm looking for? Thank you very much for your time and assistance.