According to the blockchain halving rule, the Bitcoin block mining reward halves every 210,000 blocks, the coin reward will be decreased from 25 to 12.5 coins at 10 Jul 2016 13:24:42,
Can anyone predict what will be the exact time and date for the next halving after this halving?
You can guess, but that's all it will be. In the last 3 months, the halving this year has moved up by more than 2 weeks. There are a lot of variables and it is impossible to even try to make a prediction based on anything known.
It is possible to predict. Watch!
When the current halving occurs down to a 12.5 btc block reward the next halving down to 6.25 btc will occur approximately 4 years later.