A DESCRIPTION OF THE PROBLEM :
When parsing ZonedDateTime and format doesn't contain a time part, method parse fails with exception 'Unable to obtain ZonedDateTime from TemporalAccessor'

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the submitted source code.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
2018-09-19T00:00Z
ACTUAL -
java.time.format.DateTimeParseException: Text '2018-09-19' could not be parsed: Unable to obtain ZonedDateTime from TemporalAccessor: {},ISO,Z resolved to 2018-09-19 of type
java.time.format.Parsed
        at java.time.format.DateTimeFormatter.createError(Unknown Source)
        at java.time.format.DateTimeFormatter.parse(Unknown Source)
        at java.time.ZonedDateTime.parse(Unknown Source)
        at ZonedDateParsingBug.main(ZonedDateParsingBug.java:14)
Caused by: java.time.DateTimeException: Unable to obtain ZonedDateTime from TemporalAccessor: {},ISO,Z resolved to 2018-09-19 of type java.time.format.Parsed
        at java.time.ZonedDateTime.from(Unknown Source)
        at java.time.format.Parsed.query(Unknown Source)
        ... 3 more
Caused by: java.time.DateTimeException: Unable to obtain LocalTime from TemporalAccessor: {},ISO,Z resolved to 2018-09-19 of type java.time.format.Parsed
        at java.time.LocalTime.from(Unknown Source)
        ... 5 more

---------- BEGIN SOURCE ----------
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Locale;

public class ZonedDateParsingBug {

    public static void main(String args[]) {
        int retval = 1;
        try {
            DateTimeFormatter inputDateTimeFormatter =
                    DateTimeFormatter.ofPattern("yyyy-MM-dd", Locale.ROOT)
                    .withZone(ZoneOffset.UTC);
            ZonedDateTime dateTime = ZonedDateTime.parse("2018-09-19", inputDateTimeFormatter);
            System.out.printf("%s%n", dateTime);
            retval = 0;
        } catch (Exception e) {
            e.printStackTrace();
        }
        System.exit(retval);
    }
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Catch exception, and compose ZonedDateTime object from LocalDateTime.

FREQUENCY : always