I lied about Employment Dates and now I’m scared!!

Ok so a few weeks ago I had a job interview for a position that I currently hold at another company. When applying for this same title in other places you need 3+ years experience and I only have 1 full year. I wasn’t hearing anything back so I decided to change the dates on my resume to say that I’ve been in my position for 2 years. I hate that I did this because I am now freaking out.

The job interview asked if I would do a background check and I agreed, and I heard back from them that they want me back in their office for a final interview and he wants to ask me a few more questions. He said he would rather I come in person so I can meet another colleague of his. I’m nervous that they know. I feel bad about lying but i really want this job. Has anyone done this before?