Java Instant adjustInto() method

The adjustInto() method of Java Instant class is used to adjust the specified Temporal(Interface) object which have this instant.

This method returns a temporal object of the same observable type as the input with the instant changed to be the same as this.

Syntax

Parameters

temporal - The target object to be adjusted, not null

Return

The adjusted object, not null

The adjustment is equivalent to using Temporal.with(TemporalField, long) twice,passing ChronoField.INSTANT_SECONDS and ChronoField.NANO_OF_SECOND as the fields.

In most cases, it is clearer to reverse the calling pattArn by using Temporal.with(TemporalAdjuster):

Exceptions

DateTimeException - If unable to make the adjustment

ArithmeticException - If numeric overflow occurs

Example 1

import java.time.Instant;
import java.time.ZonedDateTime;
import java.time.temporal.Temporal;

public class InstantAdjustIntoExample1 {
  public static void main(String[] args) {
    Instant instant = Instant.parse("2014-12-03T10:15:30.00Z");
    ZonedDateTime l = ZonedDateTime.now();
    Temporal t = instant.adjustInto(l);
    System.out.println((ZonedDateTime)t);
 
  }
}

Output:

The output will be like this.
2014-12-03T10:15:30Z[Asia/New_Delhi]

Example 2

import java.time.Instant;
import java.time.ZonedDateTime;

public class InstantAdjustIntoExample2 {
  public static void main(String[] args) {
	ZonedDateTime date = ZonedDateTime.now();
      System.out.println(date);  

      Instant instant = Instant.parse("2017-02-03T10:37:30.00Z");

      date = (ZonedDateTime)instant.adjustInto(date);
      System.out.println(date);  
   }
}

Output:

2017-03-10T11:10:35.454+05:30[Asia/Calcutta]
2017-02-03T16:07:30+05:30[Asia/Calcutta]

Example 3

import java.time.Instant;
import java.time.OffsetDateTime;
import java.time.ZonedDateTime;
import java.time.temporal.Temporal;

public class InstantadjustIntoExample3 {

    public static void main(String... args) {
        Instant i = Instant.parse("2017-04-09T10:15:30.00Z");
        System.out.println(i);

        adjustInto(i, OffsetDateTime.now());
        adjustInto(i, ZonedDateTime.now());
        adjustInto(i, Instant.now());

    }

    private static void adjustInto(Instant i, Temporal t) {
        Temporal t2 = i.adjustInto(t);
        System.out.printf("%15s > %s > %s%n", t.getClass().getSimpleName(), t, t2);
    }
}

Output:

2017-04-09T10:15:30Z
 OffsetDateTime > 2017-05-01T15:50:28.538-05:00 > 2017-04-09T05:15:30-05:00
  ZonedDateTime > 2017-05-01T15:50:28.540-05:00[Asia/New_Delhi] > 2017-04-09T05:15:30-05:00[Asia/New_Delhi]
        Instant > 2017-05-01T20:50:28.540Z > 2017-04-09T10:15:30Z

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