Java - How to convert Calendar to LocalDateTime?

Java Date Time Java 

In this quick example, we will show how to convert java.util.Calendar to java.time.LocalDateTime.

package com.logicbig.example;

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

public class CalendarToLocalDateTimeExample {

    public static LocalDateTime toLocalDateTime(Calendar calendar) {
        if (calendar == null) {
            return null;
        }
        TimeZone tz = calendar.getTimeZone();
        ZoneId zid = tz == null ? ZoneId.systemDefault() : tz.toZoneId();
        return LocalDateTime.ofInstant(calendar.toInstant(), zid);
    }

    public static void main(String[] args) {
        Calendar now = Calendar.getInstance();
        LocalDateTime localDateTime = toLocalDateTime(now);
        System.out.println(localDateTime);
    }
}

Output

2026-07-27T20:25:14.309