cdm/src/main/java/ucar/nc2/ft2/coverage/TimeHelper.java
public TimeHelper setReferenceDate(CalendarDate refDate) {
    CalendarDateUnit cdUnit = CalendarDateUnit.of(dateUnit.getCalendar(), dateUnit.getCalendarField(), refDate);
    return new TimeHelper(cdUnit);
  }
public TimeHelper setReferenceDate(CalendarDate refDate) {
    CalendarDateUnit cdUnit = CalendarDateUnit.of(dateUnit.getCalendar(), dateUnit.getCalendarField(), refDate);
    return new TimeHelper(cdUnit);
  }
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