Java Data Type - 如何将天数转换为毫秒

public class Main{
  public static void main(String[] argv){
    System.out.println(daysToMillis(1));
  }
  public static long daysToMillis(long days)
  {
      long daysInMillis = days * 24L * 60L * 60000L;
      return daysInMillis;
  }

}