Unable to obtain OffsetDateTime from TemporalAccessor

Question

When I do this

String datum = "20130419233512"; DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMddHHmmss").withZone(ZoneId.of("Europe/Berlin")); OffsetDateTime datetime = OffsetDateTime.parse(datum, formatter);

I get the following exception:

 java.time.format.DateTimeParseException: Text '20130419233512' could not be parsed: Unable to obtain OffsetDateTime from TemporalAccessor: {InstantSeconds=1366407312},ISO,Europe/Berlin resolved to 2013-04-19T23:35:12 of type java.time.format.Parsed

How can I parse my datetime string so that it is interpreted as always being from the timezone "Europe/Berlin" ?

I have discussed the theory behind java.time at length here: stackoverflow.com/a/56508200/145989 — Ondra Žižka
– Ondra Žižka, Commented Jun 8, 2019 at 17:56

Community · Accepted Answer · 2017-05-23 11:53:04Z

The problem is that there is a difference between what a ZoneId is and a ZoneOffset is. To create a OffsetDateTime, you need an zone offset. But there is no one-to-one mapping between a ZoneId and a ZoneOffset because it actually depends on the current daylight saving time. For the same ZoneId like "Europe/Berlin", there is one offset for summer and a different offset for winter.

For this case, it would be easier to use a ZonedDateTime instead of an OffsetDateTime. During parsing, the ZonedDateTime will correctly be set to the "Europe/Berlin" zone id and the offset will also be set according to the daylight saving time in effect for the date to parse:

public static void main(String[] args) { String datum = "20130419233512"; DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMddHHmmss").withZone(ZoneId.of("Europe/Berlin")); ZonedDateTime datetime = ZonedDateTime.parse(datum, formatter); System.out.println(datetime.getZone()); // prints "Europe/Berlin" System.out.println(datetime.getOffset()); // prints "+02:00" (for this time of year) }

Note that if you really want an OffsetDateTime, you can use ZonedDateTime.toOffsetDateTime() to convert a ZonedDateTime into an OffsetDateTime.

I like that you do this in one step, rather than in two like I showed. I'll leave my answer since both will work, but I'd recommend yours for the green checkmark. :)
Since I need OffsetDateTime I use now OffsetDateTime datetime = ZonedDateTime.parse(datum, formatter).toOffsetDateTime(); .
@asmaier Yep, that's what I commented also. You can use that to convert to an OffsetDateTime.
The documentation of that method says "The zone ID is ignored". What does that mean exactly?

Matt Johnson-Pint · Accepted Answer · 2016-02-09 17:31:18Z

There's no offset in your source data, and thus OffsetDateTime is not the correct type to use during parsing.

Instead, use a LocalDateTime, since that is the type that most closely resembles the data you have. Then use atZone to assign it a time zone, and if you still need an OffsetDateTime, you can call toOffsetDateTime from there.

String datum = "20130419233512"; DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMddHHmmss"); LocalDateTime datetime = LocalDateTime.parse(datum, formatter); ZonedDateTime zoned = datetime.atZone(ZoneId.of("Europe/Berlin")); OffsetDateTime result = zoned.toOffsetDateTime();

Thanks. That works for me. I somehow assumed the OffsetDateTime.parse() method would do these steps internally for me.
This one works perfectly, I somehow thought the same thing as OP. This looks neat!

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