Date from() method in Java with Examples

The from(Instant inst) method of Java Date class returns an instance of date which is obtained from an Instant object.

Syntax:

public static Date from(Instant inst)

Parameters: The method takes one parameter inst of Instant type which is required to be converted.

Return Value: The method returns a date representing the same point on the timeline as the passing instant.

Exceptions:

• NullPointerException: This is thrown when the instant is left null.
• IllegalArgumentException: This is thrown when the instant is too large to be represented as a Date.

Below programs illustrate the use of from() Method in Java:
Example 1:

// Java code to demonstrate
// from() method of Date class

import java.time.Instant;
import java.util.Date;

public class JavaDateDemo {
    public static void main(String args[])
    {
        // Creating Date Object
        Date dateOne = new Date();

        // Creating Instant object
        Instant inst = Instant.now();

        // Displaying the instant
        System.out.println(
            "Present: "
            + dateOne.from(inst));
    }
}

Output:

Present: Tue Mar 26 06:45:40 UTC 2019

Example 2:

import java.util.Date;
import java.util.Calendar;
import java.time.Instant;

public class GfG {
    public static void main(String args[])
    {
        // Creating a Calendar object
        Calendar c1 = Calendar.getInstance();

        // Set Month
        // MONTH starts with 0 i.e. ( 0 - Jan)
        c1.set(Calendar.MONTH, 00);

        // Set Date
        c1.set(Calendar.DATE, 30);

        // Set Year
        c1.set(Calendar.YEAR, 2019);

        // Creating a date object
        // with specified time.
        Date dateOne = c1.getTime();

        Instant inst = dateOne.toInstant();

        System.out.println(
            "Date: " + dateOne.from(inst));
    }
}

Output:

Date: Wed Jan 30 06:45:43 UTC 2019

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/Date.html#from-java.time.Instant-