As an AI language model, I am based on a constantly evolving and updating database of information. My training data comes from various sources that have been accumulated and updated over time, including books, academic publications, websites, and other publicly available resources. The exact date of the most recent information used to train me cannot be determined as my data is continually being updated to reflect the latest information available. However, my models are constantly improving as new and more accurate data becomes available in different fields.