My PC really doesn't have a complete date, as it's been receiving upgrades for 3 years.
As for early 2016, the specs are pretty average. My trusty i7 4790K that gets the job done, overclocked to 4.9 GHz @ 1.375V. (load temp, 80 degrees Celsius) 18GB of 2133 MHz DDR3 RAM The 250GB 840 EVO SSD that I've been using for a year or so might receive an upgrade soon x4 1TB WD Blue drives might also be replaced with x2 4TB ones Case is an H440, which I might also upgrade due to the terrible airflow A GTX 970 that I'm pretty much happy with for now.
That's about it honestly, not much to say.
EDIT: Necessary edits, the parts were bought pretty much as soon as they came out. So they were kinda pricey. This includes the SSD, RAM, mobo, headphones. I was an early adopter back then.