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Java 获取当天/前一天起始和结束时间，格林威治时间与北京时间转换?
Java获取当天的起始时间和结束时间- http://blog.csdn.net/leeyefang/article/details/45057105
java获取各种格式的时间，获取昨天明天日期，获取一天的开始结束时间- http://blog.csdn.net/ziluolanzhang/article/details/50717398

public static long todayEarlyMorningTimeStamp() {// 今天凌晨
		Calendar todayStart = Calendar.getInstance();
		todayStart.set(Calendar.HOUR_OF_DAY, 0);// 今天开始是从凌晨0点开始
		todayStart.set(Calendar.MINUTE, 0);
		todayStart.set(Calendar.SECOND, 0);
		todayStart.set(Calendar.MILLISECOND, 0);
		Date date = todayStart.getTime();
		System.out.println("------------- 今天凌晨--------------" + date.getTime());
		return date.getTime();
	}	public static long yesterdayEarlyMorningTimeStamp() {// 昨天凌晨
		long onedayTimeStamp = 24 * 60 * 60 * 1000;
		System.out.println("------------- 昨天凌晨 --------------" + (todayEarlyMorningTimeStamp() - onedayTimeStamp));
		return todayEarlyMorningTimeStamp() - onedayTimeStamp;
	}	private static Date todayStart() {
		System.out.println("------------- 今天开始时间 --------------");
		Calendar todayStart = Calendar.getInstance();
		todayStart.set(Calendar.HOUR_OF_DAY, 0);// 今天开始是从凌晨0点开始
		// todayStart.set(Calendar.HOUR, 0);
		todayStart.set(Calendar.MINUTE, 0);
		todayStart.set(Calendar.SECOND, 0);
		todayStart.set(Calendar.MILLISECOND, 0);		Date date = todayStart.getTime();
		long timeStamp = date.getTime();		System.out.println("今天开始时间的时间戳timeStamp :" + timeStamp);
		System.out.println("System.currentTimeMillis():" + System.currentTimeMillis());		System.out.println("todayStart.getTime():" + todayStart.getTime());
		SimpleDateFormat format = new SimpleDateFormat();
		System.out.println("todayStart.getTime() format:" + format.format(todayStart.getTime()));		return todayStart.getTime();	}	private static Date todayEnd() {
		System.out.println("-------------- 今天结束时间 -------------");
		Calendar todayEnd = Calendar.getInstance();
		todayEnd.set(Calendar.HOUR_OF_DAY, 23);// 今天开始是从晚上24点结束
		// todayEnd.set(Calendar.HOUR, 23);
		todayEnd.set(Calendar.MINUTE, 59);
		todayEnd.set(Calendar.SECOND, 59);
		todayEnd.set(Calendar.MILLISECOND, 999);
		System.out.println("todayEnd.getTime():" + todayEnd.getTime());
		SimpleDateFormat format = new SimpleDateFormat();
		// Date date2 = format.format(todayEnd.getTime();
		System.out.println("todayEnd.getTime() format:" + format.format(todayEnd.getTime()));
		return todayEnd.getTime();
	}	private static void yesterday() {
		System.out.println("------------昨天开始与结束时间---------------");
		Date dNow = new Date(); // 当前时间
		Date dBefore = new Date();
		Calendar calendar = Calendar.getInstance(); // 得到日历
		calendar.setTime(dNow);// 把当前时间赋给日历
		calendar.add(Calendar.DAY_OF_MONTH, -1); // 设置为前一天
		dBefore = calendar.getTime(); // 得到前一天的时间
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); // 设置时间格式
		String defaultStartDate = sdf.format(dBefore); // 格式化前一天
		defaultStartDate = defaultStartDate + " 00:00:00";
		String defaultEndDate = defaultStartDate.substring(0, 10) + " 23:59:59";
		System.out.println("前一天的起始时间是：" + defaultStartDate);
		System.out.println("前一天的结束时间是：" + defaultEndDate);
	}	public static void gregorianStartTime() {
		Date date = new Date();// 取时间
		// date.clearTime();
		Calendar calendar = new GregorianCalendar();
		calendar.setTime(date);
		calendar.set(Calendar.HOUR, 0);
		calendar.set(Calendar.MINUTE, 0);
		calendar.set(Calendar.SECOND, 0);
		calendar.set(Calendar.MILLISECOND, 0);
		System.out.println("开始时间：" + calendar.getTime());		calendar.set(Calendar.HOUR, 23);
		calendar.set(Calendar.MINUTE, 59);
		calendar.set(Calendar.SECOND, 59);
		calendar.set(Calendar.MILLISECOND, 999);
		System.out.println("结束时间：" + calendar.getTime());
		System.out.println("---------------------------");
		System.out.println("当前时间：" + System.currentTimeMillis());
	}	private static void get() {
		SimpleDateFormat format = new SimpleDateFormat(" yyyy-MM-dd HH:mm:ss ");
		String time = " 1970-01-06 11:45:55 ";// 注：改正后这里前后也加了空格
		Date date = null;
		try {
			date = format.parse(time);
		} catch (ParseException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		System.out.println("Format To times:" + date.getTime());
	}

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/**
 * 显示发布时间（发布时间是指文章第一次创建的时间，不是最近更新时间）的规则：
 * 发布时间距离当前时间1小时内：20分钟前
 * 发布时间距离当前时间超过1小时且在当天之内：5小时前
 * 发布时间在当前日期的前1天： 昨天 12:30
 * 其他情况显示日期：12-08
 *
 * @param publishTime
 * @return
 */
public static String dateFormat(long publishTime) {if (publishTime <= 0) {return "";}if (publishTime - yesterdayEarlyMorningTimeStamp() < 0) {//新闻是在昨天之前发的
        return formatDate(publishTime, "MM-dd");} else {if (publishTime - todayEarlyMorningTimeStamp() < 0) {//新闻是在昨天发的
            return "昨天 " + formatDate(publishTime, "HH:mm");} else {//新闻是在今天发的
            long currentTime = System.currentTimeMillis();//当前时间戳
            long oneHourTimeStamp = 60 * 60 * 1000;//一个小时的时间戳
            if ((currentTime - publishTime) >= oneHourTimeStamp) {//今天之内，一小时之外
                return (publishTime - todayEarlyMorningTimeStamp()) / oneHourTimeStamp + "小时前";} else {//今天之内，一小时之内
                return (currentTime - publishTime) / 1000 + "分钟前";}}}
}public static String formatDate(long timeStamp, String regularRule) {SimpleDateFormat formatter = new SimpleDateFormat(regularRule);//yyyy-MM-dd HH:mm:ss
    String dateString = formatter.format(timeStamp);return dateString;
}public static long todayEarlyMorningTimeStamp() {//今天凌晨
    Calendar todayStart = Calendar.getInstance();todayStart.set(Calendar.HOUR_OF_DAY, 0);//今天开始是从凌晨0点开始
    todayStart.set(Calendar.MINUTE, 0);todayStart.set(Calendar.SECOND, 0);todayStart.set(Calendar.MILLISECOND, 0);Date date = todayStart.getTime();return date.getTime();
}public static long yesterdayEarlyMorningTimeStamp() {//昨天凌晨
    long onedayTimeStamp = 24 * 60 * 60 * 1000;//一天的时间戳
    return todayEarlyMorningTimeStamp() - onedayTimeStamp;
}

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JAVA实现UTC时间转换成北京时间
UTCToCST("2017-11-27T03:16:03.944Z", "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
public static void UTCToCST(String UTCStr, String format) throws ParseException {Date date = null;SimpleDateFormat sdf = new SimpleDateFormat(format);date = sdf.parse(UTCStr);System.out.println("UTC时间: " + date);Calendar calendar = Calendar.getInstance();calendar.setTime(date);calendar.set(Calendar.HOUR, calendar.get(Calendar.HOUR) + 8);//calendar.getTime() 返回的是Date类型，也可以使用calendar.getTimeInMillis()获取时间戳System.out.println("北京时间: " + calendar.getTime());}