Convert Mountain *Standard* Time to UTC, Java

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//openjdk version '11.0.5'

import java.time.*;
import java.time.format.*;
import java.util.*;

class Rextester
{

/* I believe that North American time zones using Mountain Standard Time all year include
     * America/Dawson_Creek, America/Dawson, America/Creston, America/Hermosillo,
     * America/Phoenix, America/Whitehorse and America/Fort_Nelson- Pick one.
     */
    private static final ZoneId ZONE_USING_MST_ALL_YEAR = ZoneId.of("America/Phoenix");
    private static final Set<ZoneId> PREFERRED_ZONE_SET = Set.of(ZONE_USING_MST_ALL_YEAR);
    private static final DateTimeFormatter EVENT_TIMESTAMP_FORMATTER
            = new DateTimeFormatterBuilder()
                    .appendPattern("uuuu-MM-dd HH:mm:ss ")
                    .appendZoneText(TextStyle.SHORT, PREFERRED_ZONE_SET)
                    .toFormatter(Locale.US);

public static void main(String... args) {
        List<String> dateTimeStrings = List.of("2023-03-20 08:53:19 MST", "2023-01-20 08:53:19 MST");
        for (String dtString: dateTimeStrings) {
            ZonedDateTime zdt = ZonedDateTime.parse(dtString, EVENT_TIMESTAMP_FORMATTER);
            Instant instant = zdt.toInstant();
            OffsetDateTime odt = zdt.toOffsetDateTime().withOffsetSameInstant(ZoneOffset.UTC);
            System.out.format(Locale.US, "%13s -> %-42s -> %-19s or %s%n", dtString, zdt, instant, odt);
        }
    }

}

[ + ] Show input
Compilation time: 0.61 sec, absolute running time: 0.26 sec, cpu time: 0.27 sec, memory peak: 45 Mb, absolute service time: 0,98 sec