IsoChronology localDateTime() method in Java with Example

The localDateTime() method of java.time.chrono.IsoChronology class is used to retrieve the local date and time according to Iso calendar system from any other object of temporal accessor.

Syntax:

public LocalDateTime localDateTime(
         TemporalAccessor temporal)

Parameter: This method takes the object of any temporal accessor as a parameter.

Return Value: This method returns the local date and time according to Iso calendar system from any other object of the temporal accessor.

Below are the examples to illustrate the localDateTime() method:

Example 1:

// Java program to demonstrate
// localDateTime() method

import java.util.*;
import java.io.*;
import java.time.*;
import java.time.chrono.*;

public class GFG {
    public static void main(String[] argv)
    {
        try {
            // creating and initializing
            // LocalDate Object
            LocalDate hidate
                = LocalDate.now();

            // getting IsoChronology
            // used in LocalDate
            IsoChronology crono
                = hidate.getChronology();

            // creating and initializing
            // TemporalAccessor object
            ZonedDateTime zonedate
                = ZonedDateTime.parse(
                    "2018-10-25T23:12:31."
                    + "123+02:00[Europe/Paris]");

            // getting LocalDate for the
            // given TemporalAccessor object
            // by using localDateTime() method
            LocalDateTime date
                = crono.localDateTime(zonedate);

            // display the result
            System.out.println("LocalDateTime is: "
                               + date);
        }
        catch (DateTimeException e) {
            System.out.println("passed parameter can"
                               + " not form a date");
            System.out.println("Exception thrown: " + e);
        }
    }
}

Output:

LocalDateTime is: 2018-10-25T23:12:31.123

Example 2:

// Java program to demonstrate
// localDateTime() method

import java.util.*;
import java.io.*;
import java.time.*;
import java.time.chrono.*;

public class GFG {
    public static void main(String[] argv)
    {
        try {
            // creating and initializing
            // LocalDate Object
            LocalDate hidate
                = LocalDate.now();

            // getting IsoChronology
            // used in LocalDate
            IsoChronology crono
                = hidate.getChronology();

            // creating and initializing
            // TemporalAccessor object
            LocalDateTime localdate
                = LocalDateTime
                      .parse("2018-12-30T19:34:50.63");

            // getting LocalDate for the
            // given TemporalAccessor object
            // by using localDateTime() method
            LocalDateTime date
                = crono.localDateTime(localdate);

            // display the result
            System.out.println("LocalDateTime is: "
                               + date);
        }
        catch (DateTimeException e) {
            System.out.println("passed parameter can"
                               + " not form a date");
            System.out.println("Exception thrown: " + e);
        }
    }
}

Output:

LocalDateTime is: 2018-12-30T19:34:50.630

Reference: https://docs.oracle.com/javase/9/docs/api/java/time/chrono/IsoChronology.html#localDateTime-java.time.temporal.TemporalAccessor-