Epoch floats and doubles are not good for timestamps, as the further we get from 1970 the less precise they become. Current precision with a 32-bit float (JSON

Epoch floats and doubles are not good for timestamps, as the further we get from 1970 the less precise they become. Current precision with a 32-bit float (JSON/JavaScript are 64-bit usually, though in non-JS it's common to use Bigdecimal in slight non-compliance) is much worse than one second.