How do I get the nearest hour, minute, second of a date?

This example demonstrates how to use the DateUtils.round() method to get the nearest hour, minute and second of a date.

package org.kodejava.commons.lang;

import org.apache.commons.lang3.time.DateFormatUtils;
import org.apache.commons.lang3.time.DateUtils;
import org.apache.commons.lang3.time.FastDateFormat;

import java.util.Calendar;
import java.util.Date;

public class DateRoundingDemo {
    public static void main(String[] args) {
        FastDateFormat formatter = DateFormatUtils.ISO_8601_EXTENDED_DATETIME_TIME_ZONE_FORMAT;

        Date now = new Date();
        System.out.println("now = " + formatter.format(now));

        // Get the nearest second
        Date nearestSecond = DateUtils.round(now, Calendar.SECOND);
        System.out.println("nearestSecond = " + formatter.format(nearestSecond));

        // Get the nearest minute
        Date nearestMinute = DateUtils.round(now, Calendar.MINUTE);
        System.out.println("nearestMinute = " + formatter.format(nearestMinute));

        // Get the nearest hour
        Date nearestHour = DateUtils.round(now, Calendar.HOUR);
        System.out.println("nearestHour = " + formatter.format(nearestHour));

Here are the program results:

now = 2021-09-30T06:23:24+08:00
nearestSecond = 2021-09-30T06:23:24+08:00
nearestMinute = 2021-09-30T06:23:00+08:00
nearestHour = 2021-09-30T06:00:00+08:00

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