This is a date stamp in the YYMMDD format. It indicates the original release or upload date of June 14, 2013.
To comprehend the essence of "1000giri 130614 keiko 720 high quality," let's dissect the keyword into its constituent parts: 1000giri 130614 keiko 720 high quality
Keiko's phone vibrated. An unknown number texted a single line: "Meet at Platform 7. Midnight. Bring curiosity." This is a date stamp in the YYMMDD format