Java Hour delayBeforeNextHour()

Description

delay Before Next Hour

License

Open Source License

Declaration

public static long delayBeforeNextHour() 

Method Source Code

//package com.java2s;
/*-// w ww  .  jav a 2 s.c o m
 * #%L
 * Duniter4j :: Core Shared
 * %%
 * Copyright (C) 2014 - 2017 EIS
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/gpl-3.0.html>.
 * #L%
 */

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

public class Main {
    public static long delayBeforeNextHour() {
        return nextHour().getTime() - System.currentTimeMillis();
    }

    public static Date nextHour(int hour) {
        Calendar cal = new GregorianCalendar();
        cal.setTimeInMillis(System.currentTimeMillis());
        if (cal.get(Calendar.HOUR_OF_DAY) >= hour) {
            // Too late for today: add 1 day (will wait tomorrow)
            cal.add(Calendar.DAY_OF_YEAR, 1);
        }
        cal.set(Calendar.HOUR_OF_DAY, hour);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);
        return cal.getTime();
    }

    public static Date nextHour() {
        Calendar cal = new GregorianCalendar();
        cal.setTimeInMillis(System.currentTimeMillis());
        cal.add(Calendar.HOUR, 1);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);
        return cal.getTime();
    }
}

Related

1. convertHour(Long createAt)
2. get24Hour()
3. getAlarmOnQuarterHour()
4. getAnHourBack()
5. getBeforeOneHour()