This follows the DDMMYY format (February 4, 2017). In the context of file trading, this usually represents the date the file was ripped, encoded, or uploaded to the specific platform, rather than the original DVD release date (which typically precedes the upload date).
Because this string does not correspond to a widely documented software, game, or general-interest media title, there is no official "deep guide" available in general public databases. Common Contexts for Such Strings: Media Repacks: hmn604rmjavhdtoday020417 min repack