* A specific band, artist, or musical group called "Mentality": To find the creation date, I'd need to know the specific band/artist.
* A video game, app, or software called "Mentality": Again, I need more information to find the creation date.
* A particular mental state or way of thinking: This is not something that has a specific creation date, as it's a concept that's been around for as long as humans have been able to think.
Please tell me more about what you're looking for, and I can try to give you a more helpful answer.