Analytics DATE_TRUNC_STR returns null for WEEK, DAY_OF_WEEK, DAY_OF_YEAR, TIMEZONE, TIMEZONE_HOUR, TIMEZONE_MINUTE

   boolean trunc(boolean typeWithTimezone, long chrononIn, int timeZoneOffset, TimeZone timeZone,

            AMutableInt64 chrononOut, AMutableInt32 timeZoneOffsetOut, TimeZoneHelper tzHelper) {

        GregorianCalendarSystem cal = GregorianCalendarSystem.getInstance();

        long chrononInAtTz = typeWithTimezone ? cal.adjustChrononByTimezone(chrononIn, timeZoneOffset) : chrononIn;

        int year = cal.getYear(chrononInAtTz);

        int month = cal.getMonthOfYear(chrononInAtTz, year);

        int day = cal.getDayOfMonthYear(chrononInAtTz, year, month);

        int hour = cal.getHourOfDay(chrononInAtTz);

        int minute = cal.getMinOfHour(chrononInAtTz);

        int second = cal.getSecOfMin(chrononInAtTz);

        int millis = cal.getMillisOfSec(chrononInAtTz);

        switch (this) {

            case MILLENNIUM:

            case CENTURY:

            case DECADE:

                int y = monthsDuration / GregorianCalendarSystem.MONTHS_IN_A_YEAR;

                year = year / y * y;

                // fall thru to 'YEAR'

            case YEAR:

                month = 1;

                // fall thru to 'QUARTER'

            case QUARTER:

                month = ((month - 1) / QUARTER.monthsDuration * QUARTER.monthsDuration) + 1;

                // fall thru to 'MONTH'

            case MONTH:

                day = 1;

                // fall thru to 'DAY'

            case DAY:

                hour = 0;

                // fall thru to 'HOUR'

            case HOUR:

                minute = 0;

                // fall thru to 'MINUTE'

            case MINUTE:

                second = 0;

                // fall thru to 'SECOND'

            case SECOND:

                millis = 0;

                // fall thru to 'MILLISECOND'

            case MILLISECOND:

                break;

            case WEEK:

            case DAY_OF_YEAR:

            case DAY_OF_WEEK:

            case TIMEZONE:

            case TIMEZONE_HOUR:

            case TIMEZONE_MINUTE:

            default:

                return false;

        }