@Test
  // 1000000 times: 627 mills.
  // 1000000 times: 628 mills.
  // 1000000 times: 631 mills.
  public void begTimeOfDate() {
    Calendar calendar = CalendarHelper.today();
    Calendar begTime = null;
    Calendar endTime = null;
    int count = 1000000; // 100w
    long beg = System.currentTimeMillis();
    for (int i = 0; i < count; i++) {
      begTime = CalendarHelper.begTimeOfDate(calendar);
    }
    //
    long end = System.currentTimeMillis();
    System.out.println(count + " times: " + (end - beg) + " mills. ");
    //
    System.out.println(CalendarHelper.toString(begTime));

    beg = System.currentTimeMillis();
    for (int i = 0; i < count; i++) {
      endTime = CalendarHelper.endTimeOfDate(calendar);
    }
    //
    end = System.currentTimeMillis();
    System.out.println(count + " times: " + (end - beg) + " mills. ");
    System.out.println(CalendarHelper.toString(endTime));
  }
  @Test
  public void today() {
    Calendar value = null;

    int count = 1000000; // 100w
    long beg = System.currentTimeMillis();
    for (int i = 0; i < count; i++) {
      value = CalendarHelper.today();
    }
    //
    long end = System.currentTimeMillis();
    System.out.println(count + " times: " + (end - beg) + " mills. ");

    System.out.println(CalendarHelper.toString(value));
    System.out.println(CalendarHelper.toString(value, DateHelper.DATE_TIME_MILLS_PATTERN));
  }
  @Test
  // 1000000 times: 2512 mills.
  // 1000000 times: 2789 mills.
  // 1000000 times: 2792 mills.
  public void toCalendar() {
    Calendar value = null;

    int count = 1000000; // 100w
    long beg = System.currentTimeMillis();
    for (int i = 0; i < count; i++) {
      value =
          CalendarHelper.toCalendar("2012/03/02 13:42:17:534", DateHelper.DATE_TIME_MILLS_PATTERN);
    }
    //
    long end = System.currentTimeMillis();
    System.out.println(count + " times: " + (end - beg) + " mills. ");

    System.out.println(CalendarHelper.toString(value));
    System.out.println(CalendarHelper.toString(value, DateHelper.DATE_TIME_MILLS_PATTERN));
  }
  @Test
  // 1000000 times: 1760 mills.
  // 1000000 times: 1722 mills.
  // 1000000 times: 1763 mills.
  public void toStringz() {
    Calendar today = CalendarHelper.today();
    String value = null;
    int count = 1000000; // 100w
    long beg = System.currentTimeMillis();
    for (int i = 0; i < count; i++) {
      // 2012/02/09 09:57:23:671
      // 2012/02/09 21:57:49:908
      value = CalendarHelper.toString(today, DateHelper.DATE_TIME_MILLS_PATTERN);
    }
    //
    long end = System.currentTimeMillis();
    System.out.println(count + " times: " + (end - beg) + " mills. ");

    System.out.println(value);
  }