The legal process to change the definition of the kilogram is already underway, but it had been decided that no final decision would be made before the next meeting of <answer>the General Conference on Weights and Measures in 2011</answer>. (For more detailed information, see kilogram definitions.) The Planck constant is a leading contender to form the basis of the new definition, although not the only one. Possible new definitions include "the mass of a body at rest whose equivalent energy equals the energy of photons whose frequencies sum to 7050135639273999999♠135639274×1042 Hz", or simply "the kilogram is defined so that the Planck constant equals 6966662606895999999♠6.62606896×10−34 J⋅s".
Where would the decision to change the definition of the kilogram have occured at the earliest?
the General Conference on Weights and Measures in 2011