Java Convert Calendar to LocalDateTime

Tags: Java Calendar Java LocalDateTime Java 8

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

How to convert Calendar to LocalDateTime in Java

In Java, with a given Calendar object you can follow these steps to convert it to a LocalDateTime object.

  • Step 1: convert Calendar object to Instant object using Calendar.toInstant() method.
  • Step 2: Use the LocalDateTime.ofInstant(Instant instant, ZoneId zone) method to convert the above Instant object to LocalDateTime object in system default time zone.

ConvertCalendarToLocalDateTimeExample1.java 

import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.Calendar;
import java.util.TimeZone;

public class ConvertCalendarToLocalDateTimeExample1 {
    public static void main(String... args) {
        Calendar calendar = Calendar.getInstance();

        Instant instant = calendar.toInstant();
        ZoneId zoneId = TimeZone.getDefault().toZoneId();
        LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, zoneId);

        System.out.println("Calendar year: " + calendar.get(Calendar.YEAR));
        System.out.println("Calendar month (0 to 11): " + calendar.get(Calendar.MONTH));
        System.out.println("Calendar day of month: " + calendar.get(Calendar.DAY_OF_MONTH));
        System.out.println("Calendar hour: " + calendar.get(Calendar.HOUR_OF_DAY));
        System.out.println("Calendar minute: " + calendar.get(Calendar.MINUTE));
        System.out.println("Calendar second: " + calendar.get(Calendar.SECOND));
        System.out.println("Calendar millisecond: " + calendar.get(Calendar.MILLISECOND));
        System.out.println("LocalDateTime: " + localDateTime);
    }
}
The output as below. 
Calendar year: 2022
Calendar month (0 to 11): 4
Calendar day of month: 20
Calendar hour: 0
Calendar minute: 40
Calendar second: 46
Calendar millisecond: 312
LocalDateTime: 2022-05-20T00:40:46.312

Happy Coding 😊

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