将字符串解析为LocalDateTime时出现DateTimeParseException

Question

The following works perfectly:

String startDate = "2019-10-12T00:00:00.000-07:00"

LocalDateTime startDateTime = LocalDateTime.parse(startDate,
    DateTimeFormatter.ISO_ZONED_DATE_TIME);

However, for the following code:

String startDate = "2019-10-12T00:00:00.000+07:00"

LocalDateTime startDateTime = LocalDateTime.parse(startDate,
    DateTimeFormatter.ISO_ZONED_DATE_TIME);

I get an exception:

throws java.time.format.DateTimeParseException : Text '2019-10-12T00:00:00.000 07:00' could not be parsed at index 23

Can someone help me understand what might be possibly wrong here?

Answer 1

I tried running both dates locally with the same parsing of the LocalDateTime , and they both run correctly .

I could recreate your same error by using a different date (note the space at the zone offset, instead of a + or - ) 2019-10-12T00:00:00.000 07:00 instead of 2019-10-12T00:00:00.000+07:00 . Which is what your error message shows (but not what your code has).

Are you sure that the code version you show, which uses 2019-10-12T00:00:00.000+07:00 , is the actual version that produces the error? It looks like you have been using 2019-10-12T00:00:00.000 07:00 , which then leads to the error.

Answer 2

tl;dr

(A) As mentioned in comment by Andreas , the disappearance of your + character in error message is suspicious. You likely have a character encoding problem. We here do not have enough info to diagnose that.

(B) Use OffsetDateTime rather than LocalDateTime , to fit your data.

OffsetDateTime
.parse( "2019-10-12T00:00:00.000+07:00" )
.toInstant()
.toString()

2019-10-11T17:00:00Z

See this code run live at IdeOne.com .

LocalDateTime is the wrong class

The LocalDateTime class lacks any concept of time zone or offset-from-UTC. So it cannot, by definition, represent a moment. A LocalDateTime object is not a point on the timeline.

Yet your input string indicates an offset-from-UTC, the +07:00 in 2019-10-12T00:00:00.000+07:00 . Your attempt to put this value in a LocalDateTime is a misfit, a square peg in a round hole .

Never use LocalDateTime when you mean a specific moment, a specific point on the timeline. This class is almost never used in business-oriented apps for present or past moments. When making appointments in the future, this class should be used when you want the time-of-day to remain the same regardless of politicians redefining the region's time zone.

OffsetDateTime

Parse as an OffsetDateTime object.

Your input string happens to comply fully with the ISO 8601 standard for textual date-time formats. The java.time classes use these formats by default when parsing/generating strings. So no need to specify a formatting pattern.

String input = "2019-10-12T00:00:00.000+07:00" ;
OffsetDateTime odt = OffsetDateTime.parse( input ) ;

UTC

To adjust to the wall-clock time of UTC (an offset of zero), call OffsetDateTime::withOffsetSameInstant . For your convenience, use the constant ZoneOffset.UTC .

OffsetDateTime odtUtc = odt.withOffsetSameInstant( ZoneOffset.UTC ) ;

Or simply extract an object of the basic building-block class in java.time , an Instant . An Instant is always in UTC, by definition.

Instant instant = odt.toInstant() ;

ZonedDateTime

To see the same moment as viewed through the wall-clock time used by the people of a particular region (a time zone), apply a ZoneId to get a ZonedDateTime .

ZoneId z = ZoneId.of( "Africa/Tunis" ) ;
ZonedDateTime zdt = odt.atZoneSameInstant( z ) ;

---

About java.time

The java.time framework is built into Java 8 and later. These classes supplant the troublesome old legacy date-time classes such as java.util.Date , Calendar , & SimpleDateFormat .

The Joda-Time project, now in maintenance mode , advises migration to the java.time classes.

To learn more, see the Oracle Tutorial . And search Stack Overflow for many examples and explanations. Specification is JSR 310 .

You may exchange java.time objects directly with your database. Use a JDBC driver compliant with JDBC 4.2 or later. No need for strings, no need for java.sql.* classes.

Where to obtain the java.time classes?

• Java SE 8 , Java SE 9 , Java SE 10 , Java SE 11 , and later - Part of the standard Java API with a bundled implementation.
  • Java 9 adds some minor features and fixes.
• Java SE 6 and Java SE 7
  • Most of the java.time functionality is back-ported to Java 6 & 7 in ThreeTen-Backport .
• Android
  • Later versions of Android bundle implementations of the java.time classes.
  • For earlier Android (<26), the ThreeTenABP project adapts ThreeTen-Backport (mentioned above). See How to use ThreeTenABP… .

The ThreeTen-Extra project extends java.time with additional classes. This project is a proving ground for possible future additions to java.time. You may find some useful classes here such as Interval , YearWeek , YearQuarter , and more .

Answer 3

在startDateTime中有一个额外的零，请使用startDateTime =“ 2019-10-12T00：00：00.00 + 07：00”