TOKYO, Aug 19 (Reuters) - Japanese government bond (JGB) prices were little changed on Thursday as minutes from the U.S. Federal Reserve showed policymakers are still not sure exactly when it will taper its bond buying. While the minutes showed that Fed officials felt the employment benchmark for decreasing support for the economy “could be reached this year,” they stopped short of dropping a clear hint on when tapering will start. The benchmark 10-year JGB yield was flat at 0.010%, while the 20-year yield was unchanged at 0.400%. The yield on 30-year JGBs was flat at 0.645%. (Reporting by Tokyo Markets Team; editing by Uttaresh.V) Our Standards: The Thomson Reuters Trust Principles.