Java 8 – Unable to obtain LocalDateTime from TemporalAccessor 4年前

https://mkyong.com/java8/java-8-unable-to-obtain-localdatetime-from-temporalaccessor/

An example of converting a String to LocalDateTime, but it prompts the following errors:

Java8Example.java

copy
package com.mkyong.demo;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Locale;

public class Java8Example {

    public static void main(String[] args) {

        String str = "31-Aug-2020";

        DateTimeFormatter dtf = DateTimeFormatter.ofPattern("dd-MMM-yyyy", Locale.US);

        LocalDateTime localDateTime = LocalDateTime.parse(str, dtf);

        System.out.println(localDateTime);

    }
}

Output

copy
Exception in thread "main" java.time.format.DateTimeParseException: Text '31-Aug-2020' could not be parsed: Unable to obtain LocalDateTime from TemporalAccessor: {},ISO resolved to 2020-08-31 of type java.time.format.Parsed
    at java.base/java.time.format.DateTimeFormatter.createError(DateTimeFormatter.java:2017)
    at java.base/java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1952)
    at java.base/java.time.LocalDateTime.parse(LocalDateTime.java:492)
    at com.mkyong.demo.Java8Example.main(Java8Example.java:15)
Caused by: java.time.DateTimeException: Unable to obtain LocalDateTime from TemporalAccessor: {},ISO resolved to 2020-08-31 of type java.time.format.Parsed
    at java.base/java.time.LocalDateTime.from(LocalDateTime.java:461)
    at java.base/java.time.format.Parsed.query(Parsed.java:235)
    at java.base/java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1948)
    ... 2 more
Caused by: java.time.DateTimeException: Unable to obtain LocalTime from TemporalAccessor: {},ISO resolved to 2020-08-31 of type java.time.format.Parsed
    at java.base/java.time.LocalTime.from(LocalTime.java:431)
    at java.base/java.time.LocalDateTime.from(LocalDateTime.java:457)
    ... 4 more

Solution

The date 31-Aug-2020 contains no time, to fix it, uses LocalDate.parse(str, dtf).atStartOfDay()

copy
String str = "31-Aug-2020";

  DateTimeFormatter dtf = DateTimeFormatter.ofPattern("dd-MMM-yyyy", Locale.US);

  LocalDateTime localDateTime = LocalDate.parse(str, dtf).atStartOfDay();

References

• DateTimeFormatter JavaDoc
• LocalDateTime JavaDoc
• Java 8 – How to parse date with LocalDateTime
• Java 8 – How to convert String to LocalDate

java java 8 java.time localdatetime