在 Java 中仅按小时和分钟比较 2 个日期？

Question

我正在尝试比较 2 天（实际上是 3 天）。在我的用例中，我需要比较 3 个日期。一个是 StartSleepingTime、StopSleepingTime 和 Now。我的应用程序监视用户的活动级别，并且我有一个每半小时运行一次的计划任务，以检查 NOW 是否在用户的 StartSleepingTime 和 StopSleepingTime 之间，以确保在此间隔期间停止活动监控服务。由于用户在我运行计划任务时首次登录时设置了 StartSleepingTime 和 StopSleepingTime，因此与现在相比，两者都将处于“过去”状态。目前我正在尝试仅从 3 个日期中提取小时和分钟信息并进行如下比较：

public static boolean compareHrsAndMintsOnly(Date startSH, Date now, Date stopSH) {
    boolean isNowWithinSleepingTime = false;

    Calendar startSHCalendar = Calendar.getInstance();
    startSHCalendar.setTime(startSH);
    Calendar nowCalendar = Calendar.getInstance();
    nowCalendar.setTime(now);
    Calendar stopSHCalendar = Calendar.getInstance();
    stopSHCalendar.setTime(stopSH);

    int startSHhour = startSHCalendar.get(Calendar.HOUR_OF_DAY);
    int startSHmin = startSHCalendar.get(Calendar.MINUTE);

    int nowHour = nowCalendar.get(Calendar.HOUR_OF_DAY);
    int nowMin = nowCalendar.get(Calendar.MINUTE);

    int stopSHhour = stopSHCalendar.get(Calendar.HOUR_OF_DAY);
    int stopSHmin = stopSHCalendar.get(Calendar.MINUTE);

    if ((startSHhour > nowHour && startSHmin > nowMin) && (nowHour < stopSHhour && nowMin < stopSHmin)) {
        // stop the monitoring service
        isNowWithinSleepingTime = true;
    }else {
       // start the monitoring service

        isNowWithinSleepingTime = false;
    }

    return isNowWithinSleepingTime;

}

但这由于某种原因不起作用。另外，我觉得必须有更好的方法来实现比较。请有任何建议！

Answer 1

我使用 joda-time 来处理日期。所以我会有类似的东西：

package org.devmaster.sample;

import org.joda.time.DateTime;
import org.joda.time.Interval;

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

public final class Util {

    public static boolean compareHrsAndMintsOnly(Date startSH, Date now, Date stopSH) {
        DateTime start = toDateTime(startSH);
        DateTime end = toDateTime(stopSH);

        Interval interval = new Interval(start, end);

        DateTime instant = toDateTime(now);

        // now is between startSH and stopSH
        return interval.contains(instant);
    }

    private static DateTime toDateTime(Date date) {
        Calendar c = Calendar.getInstance();
        c.setTime(date);
        return new DateTime(
                c.get(Calendar.YEAR),
                c.get(Calendar.MONTH),
                c.get(Calendar.DAY_OF_MONTH),
                c.get(Calendar.HOUR_OF_DAY),
                c.get(Calendar.MINUTE));
    }

}

编辑

如果你想玩，我做了一个示例：https://github.com/betorcs/jodatime-sample

Answer 2

试试这个：

    Calendar startSHCalendar = Calendar.getInstance();
    startSHCalendar.setTime(startSH);
    Calendar nowCalendar = Calendar.getInstance();
    nowCalendar.setTime(now);
    Calendar stopSHCalendar = Calendar.getInstance();
    stopSHCalendar.setTime(stopSH);

    int startSHhour = startSHCalendar.get(Calendar.HOUR_OF_DAY);
    int startSHmin = startSHCalendar.get(Calendar.MINUTE);
    int timeStart = startSHhour*60 + startSHmin;  //this

    int nowHour = nowCalendar.get(Calendar.HOUR_OF_DAY);
    int nowMin = nowCalendar.get(Calendar.MINUTE);
    int timeNow = nowHour*60 + nowMin;  //this

    int stopSHhour = stopSHCalendar.get(Calendar.HOUR_OF_DAY);
    int stopSHmin = stopSHCalendar.get(Calendar.MINUTE);
    int timeStop = stopSHhour*60 + stopSHmin;  //this

    if( timeStart <= timeNow  && timeNow <= timeStop ){
        //between
    }else{
        //not betwwen
    }

/!\警告，如果你在两天之间，你也必须与天比较

希望对你有帮助

Answer 3

保持简单：

if(nowHour == stopSHhour && nowMin == stopSHmin){ 
    // do something...

}