How to use

setCleanWeatherTime

method

in

net.minecraft.world.storage.WorldInfo

@Override
public void setWeather(WeatherType weatherType, long duration) {
  WorldInfo info = getWorld().getWorldInfo();
  if (WeatherTypes.THUNDER_STORM.equals(weatherType)) {
    info.setCleanWeatherTime(0);
    info.setThundering(true);
    info.setThunderTime((int) duration);
  } else if (WeatherTypes.RAIN.equals(weatherType)) {
    info.setCleanWeatherTime(0);
    info.setRaining(true);
    info.setRainTime((int) duration);
  } else if (WeatherTypes.CLEAR.equals(weatherType)) {
    info.setRaining(false);
    info.setThundering(false);
    info.setCleanWeatherTime((int) duration);
  }
}