I usually tell a recruiter/interviewer upfront which languages I use at the moment which I used say $n$ months back etc. I really need an elegant way of putting

I usually tell a recruiter/interviewer upfront which languages I use at the moment which I used say $n$ months back etc. I really need an elegant way of putting the time information in my resume though. I also mention specifically the languages used at different places when I talk about "experience" in that place.