Parsing a ZonedDateTime String with timezone offset value

Question

I am trying to parse an ISO8601 time string of format "yyyy-MM-dd'T'HH:mm:ssZ" using the below line for ZonedDateTime object:

ZonedDateTime date = ZonedDateTime.parse("2021-02-19T14:32:12+0000", DateTimeFormatter.ISO_ZONED_DATE_TIME);

However I am getting the below error when doing this:

java.time.format.DateTimeParseException: Text '2021-02-19T14:32:12+0000' could not be parsed at index 19

I cant imagine this is not allowed as the + symbol is a valid character for the parse. Can anyone assist on what is wrong here?

My answer here might be helpful? Or this question; Convert a string to ZonedDateTime. — Anonymous
– Anonymous, Commented Feb 19, 2021 at 15:21

MC Emperor · Accepted Answer · 2021-02-19 15:33:37Z

2

~~That is because ISO_ZONED_DATE_TIME expects both an offset and a zone.~~ See edit, it is not required in all cases. It is because the offset must contain a colon.

See the docs.

Use DateTimeFormatter.ofPattern("uuuu-MM-dd'T'HH:mm:ssxx", Locale.ROOT) instead. Alternatively, you could use the DateTimeFormatterBuilder:

new DateTimeFormatterBuilder()
    .append(DateTimeFormatter.ISO_DATE_TIME)
    .appendPattern("xx")
    .toFormatter(Locale.ROOT);

Edit

Only reading the summary fragment of the Javadoc is apparently not enough. The zone id is not strictly required by the ISO_ZONED_DATE_TIME, as mentioned in the comments. The second bullet point there mentions it: "If the zone ID is not available or is a ZoneOffset then the format is complete".

edited Feb 19, 2021 at 15:33

answered Feb 19, 2021 at 14:48

MC Emperor

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2 Comments

MisterIbbs Over a year ago

Thank you, this approach works and I opted to use the older format syntax as the offset needs to have the 4 digits present rather than two. DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ssZ", Locale.ROOT)

Anonymous Over a year ago

ISO_ZONED_DATE_TIME lives happily without the zone ID. The documentation that you link to says that If the zone ID is not available … then the format is complete after the zone offset. The real problem was the lack of colon in the offset. You are correct that xx in the format pattern string solves it (no matter if using a builder or not).

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