presto-main/src/main/java/io/prestosql/type/DateTimeOperators.java/DateTimeOperators/timestampWithTimeZoneMinusIntervalYearToMonth
class DateTimeOperators:    @ScalarOperator(SUBTRACT)
    @SqlType(StandardTypes.TIMESTAMP_WITH_TIME_ZONE)
    public static long timestampWithTimeZoneMinusIntervalYearToMonth(@SqlType(StandardTypes.TIMESTAMP_WITH_TIME_ZONE) long left, @SqlType(StandardTypes.INTERVAL_YEAR_TO_MONTH) long right)
    {
        long dateTimeWithTimeZone = unpackChronology(left).monthOfYear().add(unpackMillisUtc(left), -right);
        return updateMillisUtc(dateTimeWithTimeZone, left);
    }