presto-main/src/main/java/io/prestosql/operator/scalar/DateTimeFunctions.java/DateTimeFunctions/monthFromTimestampWithTimeZone
class DateTimeFunctions:    @Description("month of the year of the given timestamp")
    @ScalarFunction("month")
    @SqlType(StandardTypes.BIGINT)
    public static long monthFromTimestampWithTimeZone(@SqlType(StandardTypes.TIMESTAMP_WITH_TIME_ZONE) long timestampWithTimeZone)
    {
        return unpackChronology(timestampWithTimeZone).monthOfYear().get(unpackMillisUtc(timestampWithTimeZone));
    }