Java: Get the start time of next hour

Below snippet return the start time of next hour.

public static long getStartOfNextHour(long now) {
	Calendar calendar = Calendar.getInstance();

	calendar.setTime(new Date(now));
	calendar.set(Calendar.MILLISECOND, 0);
	calendar.set(Calendar.SECOND, 0);
	calendar.set(Calendar.MINUTE, 0);
	calendar.add(Calendar.HOUR, 1);

	return calendar.getTime().getTime();
}

Find the below working application.

 

GetStartOfNextHour.java

package com.sample.app.time;

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

public class GetStartOfNextHour {
	public static long getStartOfNextHour(long now) {
		Calendar calendar = Calendar.getInstance();

		calendar.setTime(new Date(now));
		calendar.set(Calendar.MILLISECOND, 0);
		calendar.set(Calendar.SECOND, 0);
		calendar.set(Calendar.MINUTE, 0);
		calendar.add(Calendar.HOUR, 1);

		return calendar.getTime().getTime();
	}

	public static void main(String args[]) {
		Date today = new Date();

		long startOfNextHourInMillis = getStartOfNextHour(today.getTime());

		Date startOfNextHour = new Date(startOfNextHourInMillis);

		System.out.println("today : " + today);
		System.out.println("startOfNextHour : " + startOfNextHour);

	}
}

Output

today : Sat Feb 26 10:21:25 IST 2022
startOfNextHour : Sat Feb 26 11:00:00 IST 2022

 

 

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