TcxPivotGridGroupInterval = (
    giDefault,
    giDate,
    giDateDay,
    giDateDayOfWeek,
    giDateDayOfYear,
    giDateWeekOfMonth,
    giDateWeekOfYear,
    giDateMonth,
    giDateQuarter,
    giDateYear,
    giYearAge,
    giMonthAge,
    giWeekAge,
    giDayAge,
    giAlphabetical,
    giNumeric,
    giCustom
);