Java Convert Instant to Calendar

Tags: Java Instant Java Calendar Java 8

In this Java core tutorial we learn how to convert a java.time.Instant object into java.util.Calendar object in Java programming language.

How to convert Instant to Calendar in Java

In Java, we can follow the steps below to create a new Calendar object from a given Instant object.

  • Step 1: create a new ZonedDateTime object in system time zone from the Instant object.
  • Step 2: create new Calendar object from ZonedDateTime object using GregorianCalendar.from(ZonedDateTime zdt) static method.

In the following Java code, we show how to convert Instant to Calendar.

ConvertInstantToCalendarExample1.java 

import java.time.Instant;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.util.Calendar;
import java.util.GregorianCalendar;

public class ConvertInstantToCalendarExample1 {
    public static void main(String... args) {
        Instant instant = Instant.now();

        ZonedDateTime zonedDateTime = ZonedDateTime.ofInstant(instant, ZoneId.systemDefault());
        Calendar calendar = GregorianCalendar.from(zonedDateTime);

        System.out.println("Instant: " + instant);
        System.out.println("Calendar: " + calendar);
    }
}
The output as below. 
Instant: 2022-05-17T15:39:11.196125500Z
Calendar: java.util.GregorianCalendar[time=1652801951196,areFieldsSet=true,areAllFieldsSet=true,lenient=true,zone=sun.util.calendar.ZoneInfo[id="Asia/Bangkok",offset=25200000,dstSavings=0,useDaylight=false,transitions=3,lastRule=null],firstDayOfWeek=2,minimalDaysInFirstWeek=4,ERA=1,YEAR=2022,MONTH=4,WEEK_OF_YEAR=20,WEEK_OF_MONTH=3,DAY_OF_MONTH=17,DAY_OF_YEAR=137,DAY_OF_WEEK=3,DAY_OF_WEEK_IN_MONTH=3,AM_PM=1,HOUR=10,HOUR_OF_DAY=22,MINUTE=39,SECOND=11,MILLISECOND=196,ZONE_OFFSET=25200000,DST_OFFSET=0]

Happy Coding 😊

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