DateTimeFormatter throws DateTimeParseException for date string

Question

The following code is throwing a DateTimeParseException:

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");
ZonedDateTime dt = ZonedDateTime.parse(
               "2019-01-01",
                formatter.withZone(ZoneId.of("UTC"))
        )

It also throws an exception with

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");
ZonedDateTime dt = ZonedDateTime.parse(
               "2019-01-01",
                formatter)
        )

As does

DateTimeFormatter formatter = DateTimeFormatter.ISO_DATE;
ZonedDateTime dt = ZonedDateTime.parse(
                   "2019-01-01",
                    formatter)
            )

The SimpleDateFormat parser works just fine however -- I'm debating using it instead even though it's not thread safe and (I believe?) scheduled to be deprecated.

Obviously I'd prefer to use the java.time API, but I can't get this thing to work even after following the documented examples online. What do I do?

I would suspect that a ZonedDateTime also needs a time part , — user85421
– user85421, Commented Oct 21, 2019 at 20:13
ZonedDateTime dt = LocalDate.parse("2019-01-01", formatter).atTime(LocalTime.of(0,0,0)).atZone(ZoneId.of("UTC")) — bdkosher
– bdkosher, Commented Oct 21, 2019 at 20:14
Why do you think that you want a ZonedDateTime? For a date use LocalDate. For at date and time in UTC use Instant or if you insist, OffsetDateTime. — Anonymous
– Anonymous, Commented Oct 21, 2019 at 20:43

Jacob G. · Accepted Answer · 2019-10-21 20:26:29Z

4

A ZonedDateTime must contain a date and a time; your input, 2019-01-01, contains only a date.

For that reason, you should use LocalDate in conjunction with LocalDate#atTime (to get a LocalDateTime object) and LocalDateTime#atZone (with ZoneOffset.UTC to get a ZonedDateTime).

var formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");
var zonedDateTime = LocalDate.parse("2019-01-01", formatter)
                             .atTime(1, 2, 3) // (hours, minutes, seconds)
                             .atZone(ZoneOffset.UTC);

The value of zonedDateTime is:

2019-01-01T01:02:03Z

edited Oct 21, 2019 at 20:26

answered Oct 21, 2019 at 20:13

Jacob G.

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Comments

Prasanth Rajendran · Accepted Answer · 2019-10-21 20:53:32Z

ZoneDateTime or LocalDateTime always expect pair values of date and time. If you do not have time value, but have to build ZoneDateTime or LocalDateTime instance then you can choose some default time value like '00:00' and proceed as follow:

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");
ZonedDateTime zonedDateTime = ZonedDateTime.of(LocalDate.parse("2019-01-01", formatter), LocalTime.MIN, ZoneId.of("UTC"));

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");
LocalDateTime localDateTime = LocalDateTime.of(LocalDate.parse("2019-01-01", formatter), LocalTime.MIN);

NOTE: java.time.LocalTime has some useful time constants MIN('00:00'), MAX('23:59:59.999999999'), MIDNIGHT('00:00'), NOON('12:00')

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