Prepend `+`

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Java 8 DateTimeFormatter parse fails for ISO dates far in future

I encountered an issue where DateTimeFormatter.ISO_DATE_TIME where date cannot be parsed if year is more then 9999. I was looking for a bug report or to understand what I am doing wrong. Also - JodaTime parse works for the same string. Java version - 8. This test fails:

    public void testParseFarInTheFuture()
    {
        String str = "10000-04-11T01:24:55.887-03:56";

        DateTimeFormatter.ISO_DATE_TIME.parse(str);
    }

Same test with year 9999 works.

Am I doing something wrong or is there a bug?

over 4 years ago · Santiago Trujillo

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Accepted Answer · 2022-04-28T14:16:08.161Z

Prepend `+`

Years with more than four digits are expected to have a leading PLUS SIGN character (+) for positive years (AD).
Negative years (BC) with any count of integers always lead with a MINUS SIGN (-).

The java.time classes generally follow the rules laid down in the ISO 8601 standard. See Wikipedia page on handling years in ISO 8601.

Code:

OffsetDateTime ldt = OffsetDateTime.parse( "+10000-04-11T01:24:55.887-03:56" ) ;

See this code run live at IdeOne.com.

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Java 8 DateTimeFormatter parse fails for ISO dates far in future

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Prepend `+`