module BSON::TimeWithZone

def _bson_to_i
  # Workaround for JRuby's #to_i rounding negative timestamps up
  # rather than down (https://github.com/jruby/jruby/issues/6104)
  if BSON::Environment.jruby?
    (self - usec.to_r/1000000).to_i
  else
    to_i
  end
end