Calendar获取时间问题。急，在线等待

[chenhuan818]

Calendar怎么获得当天的23点59分59秒，
怎么获得当月最后一天的23点59分59秒，
怎么获得当年的最后一天的23点59分59秒

我要做个统计，统计每个月的每一天的pv。我表的设计是day1，day2，。。。day31，MONTH，year。这样设计的。

急

[Steve_Samuelson]

这样符合你的需求吗？
程序运行结果如下：
2008-04-27 23:59:59 星期日
2008-04-30 23:59:59 星期三
2008-12-31 23:59:59 星期三

package $4月27日_星期日;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.GregorianCalendar;


public class $1543_Calendar {
	public static void main(String[] args) {
		GregorianCalendar cal = new GregorianCalendar();
		//设置当天的23时29分29秒
		cal.set(Calendar.HOUR_OF_DAY,23);
		cal.set(Calendar.MINUTE,59);
		cal.set(Calendar.SECOND,59);
		System.out.println(new SimpleDateFormat("yyyy-MM-dd kk:mm:ss EEEE").format(cal.getTime()));
		//设置当月最后一天的23时29分29秒
		GregorianCalendar cal2 = new GregorianCalendar();
		int month = cal2.get(Calendar.MONTH)+1;
		int year = cal2.get(Calendar.YEAR);
		if(month==1||month==3||month==5||month==7||month==8||month==10||month==12){
			cal2.set(Calendar.DAY_OF_MONTH,31);
		}else if(month==2){
			if((year%4==0&&year%100!=0)||year%400==0){
				cal2.set(Calendar.DAY_OF_MONTH,29);
			}else{
				cal2.set(Calendar.DAY_OF_MONTH,28);
			}
		}else{
			cal2.set(Calendar.DAY_OF_MONTH,30);
		}
		cal2.set(Calendar.HOUR_OF_DAY,23);
		cal2.set(Calendar.MINUTE,59);
		cal2.set(Calendar.SECOND,59);
		System.out.println(new SimpleDateFormat("yyyy-MM-dd kk:mm:ss EEEE").format(cal2.getTime()));
		//设置当年最后一天的23时29分29秒
		GregorianCalendar cal3 = new GregorianCalendar();
		cal3.set(Calendar.MONTH, 11);
		cal3.set(Calendar.DAY_OF_MONTH,31);
		cal3.set(Calendar.HOUR_OF_DAY,23);
		cal3.set(Calendar.MINUTE,59);
		cal3.set(Calendar.SECOND,59);
		System.out.println(new SimpleDateFormat("yyyy-MM-dd kk:mm:ss EEEE").format(cal3.getTime()));
	}
}

[Steve_Samuelson]

程序运行结果如下：
2008-04-27 23:59:59 星期日
2008-04-30 23:59:59 星期三
2008-12-31 23:59:59 星期三

package $4月27日_星期日;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.GregorianCalendar;


public class $1543_Calendar {
	public static void main(String[] args) {
		GregorianCalendar cal = new GregorianCalendar();
		//设置当天的23时29分29秒
		cal.set(Calendar.HOUR_OF_DAY,23);
		cal.set(Calendar.MINUTE,59);
		cal.set(Calendar.SECOND,59);
		System.out.println(new SimpleDateFormat("yyyy-MM-dd kk:mm:ss EEEE").format(cal.getTime()));
		//设置当月最后一天的23时29分29秒
		GregorianCalendar cal2 = new GregorianCalendar();
		int month = cal2.get(Calendar.MONTH)+1;
		int year = cal2.get(Calendar.YEAR);
		if(month==1||month==3||month==5||month==7||month==8||month==10||month==12){
			cal2.set(Calendar.DAY_OF_MONTH,31);
		}else if(month==2){
			if((year%4==0&&year%100!=0)||year%400==0){
				cal2.set(Calendar.DAY_OF_MONTH,29);
			}else{
				cal2.set(Calendar.DAY_OF_MONTH,28);
			}
		}else{
			cal2.set(Calendar.DAY_OF_MONTH,30);
		}
		cal2.set(Calendar.HOUR_OF_DAY,23);
		cal2.set(Calendar.MINUTE,59);
		cal2.set(Calendar.SECOND,59);
		System.out.println(new SimpleDateFormat("yyyy-MM-dd kk:mm:ss EEEE").format(cal2.getTime()));
		//设置当年最后一天的23时29分29秒
		GregorianCalendar cal3 = new GregorianCalendar();
		cal3.set(Calendar.MONTH, 11);
		cal3.set(Calendar.DAY_OF_MONTH,31);
		cal3.set(Calendar.HOUR_OF_DAY,23);
		cal3.set(Calendar.MINUTE,59);
		cal3.set(Calendar.SECOND,59);
		System.out.println(new SimpleDateFormat("yyyy-MM-dd kk:mm:ss EEEE").format(cal3.getTime()));
	}
}

[joejoe1991]

		Calendar cal = Calendar.getInstance();
		SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

		cal.set(Calendar.HOUR, 23);
		cal.set(Calendar.MINUTE, 59);
		cal.set(Calendar.SECOND, 59);

		System.out.println("当天23:59:59\t" + format.format(cal.getTime()));

		cal.set(Calendar.DATE, 0);
		cal.add(Calendar.MONTH, 1);

		System.out.println("本月最后一天23:59:59\t" + format.format(cal.getTime()));

		cal.set(Calendar.MONTH, 0);
		cal.set(Calendar.DATE, 0);
		cal.add(Calendar.YEAR, 1);
		cal.add(Calendar.DATE, -1);

		System.out.println("本年最后一天23:59:59\t" + format.format(cal.getTime()));

[joejoe1991]

改了一下：

	public static void main(String[] args) {
		Calendar cal = Calendar.getInstance();
		SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

		cal.set(Calendar.HOUR_OF_DAY, 23);
		cal.set(Calendar.MINUTE, 59);
		cal.set(Calendar.SECOND, 59);

		System.out.println("当天23:59:59\t" + format.format(cal.getTime()));

		cal.set(Calendar.DATE, 0);
		cal.add(Calendar.MONTH, 1);

		System.out.println("本月最后一天23:59:59\t" + format.format(cal.getTime()));

		cal.set(Calendar.MONTH, 0);
		cal.set(Calendar.DATE, 0);
		cal.add(Calendar.YEAR, 1);
		cal.add(Calendar.DATE, -1);

		System.out.println("本年最后一天23:59:59\t" + format.format(cal.getTime()));
	}

当天23:59:59	2008-04-27 23:59:59
本月最后一天23:59:59	2008-04-30 23:59:59
本年最后一天23:59:59	2008-12-30 23:59:59

[anqini]

package zhao;

import java.text.SimpleDateFormat;
import java.util.Calendar;

public class Son { 
	/**
	 * Calendar怎么获得当天的23点59分59秒， 
	怎么获得当月最后一天的23点59分59秒， 
	怎么获得当年的最后一天的23点59分59秒 
	 */
	public static void main(String[] args) {
		SimpleDateFormat sm = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
		Calendar c = Calendar.getInstance();
		c.set(c.get(Calendar.YEAR), c.get(Calendar.MONTH), c.get(Calendar.DATE), 23, 59, 59);
		
		System.out.println("当天的23点59分59秒→"+ sm.format(c.getTime()) );
		c.set(Calendar.DATE, c.getActualMaximum(Calendar.DATE));
		System.out.println("当月最后一天的23点59分59秒→"+ sm.format(c.getTime()) );
		
		c.set(Calendar.MONTH, 11);
		c.set(Calendar.DATE, c.getActualMaximum(Calendar.DATE));
		System.out.println("当年的最后一天的23点59分59秒 →"+ sm.format(c.getTime()) );
	}
}

[joejoe1991]

我那个有问题，.....
顶anqini

[chenhuan818]

那如何得到上个月的最后一天，上一年的最后一天呢。