There should be a date on the neck and a date on the body. If those two dates match up, thats probably the exact date your guitar was built. If they dont, it could indicate that the guitars neck was replaced at some point, or that the guitar was built from spare parts and is not an original build.

Where do you put a guitar tuner?

0:474:32How To Tune a Guitar Using a Digital Tuner - YouTubeYouTube