Scala date parse with java LocalDateTime

user_13150971 0
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I'm trying to parse a date like this "2020-07-01T00:00:00Z" with java LocalDateTime (in Scala) in this way:

LocalDateTime.parse("2020-07-01T00:00:00Z", ISO_INSTANT)

but I'm getting this exception:

java.time.format.DateTimeParseException: Text '2020-07-01T00:00:00Z' could not be parsed: Unable to obtain LocalDate from TemporalAccessor

What could be the problem here?

these are my libraries:

import java.time.format.DateTimeFormatter._
import java.time.LocalDateTime
localdatetime scala parsing java
2 Answers

You shouldn't use the ISO_INSTANT formatter, because that formatter is for parsing to Instants, while you want a LocalDateTime.

You should use another DateTimeFormatter. Here are some choices. All of these are "supersets" of the ISO_INSTANT format.

Alternatively, parse the string to an Instant first, then:

instant.atZone(ZoneOffset.UTC).toLocalDateTime()
user_51335850

You need to specify the zone the LocalDateTime is related to for parsing.

LocalDateTime.parse("2020-07-01T00:00:00Z",
        DateTimeFormatter.ISO_INSTANT.withZone(ZoneId.systemDefault()));

A LocalDateTime stores no zone information but it is, abstractly speaking, related to one anyways. Multiple LocalDateTimes can be parsed from the same UTC timestamp, i.e. the time offset of the specific (local) zone is added/subtracted.

Don't misunderstand this with ZonedDateTime. A ZonedDateTime stores zone information, thus it has a 1:1 relation to a UTC timestamp. A UTC timestamp has a 1:n relation to LocalDateTimes.

user_123232480
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