The nearest expiration date for Singapore Jet Kerosene (Platts) Futures (Aug 2016) is Sep 2, 2016.
The best time to sell a futures contract is when you've already made money on the investment, but still have plenty of time left before the expiration date. Thus, a good option would be to sell Singapore Jet Kerosene (Platts) Futures (Aug 2016) before Sep 2, 2016.