code: public static long TimesBetween(String long1, String long2) {
          long l1 = null == long1 ? 0 : (Pattern.matches(numerical, long1) ? Long.parseLong(long1) : 0);
          long l2 = null == long2 ? 0 : (Pattern.matches(numerical, long2) ? Long.parseLong(long2) : 0);
          return TimesBetween(l1, l2);
      }
docs: 计算两个时间之间的差