package org.apple.date;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

/**

* 周期时间

* @author shaoyu

*

*/

public class CycleDate {

public static void main(String[] args) {

SimpleDateFormat dateformat=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss E");

Calendar calendar = Calendar.getInstance();

//calendar.setTime(new Date());

System.out.println(calendar.get(Calendar.YEAR));

System.out.println(calendar.get(Calendar.MONTH)+1);// 月加1

System.out.println(calendar.get(Calendar.DAY_OF_MONTH));

System.out.println("当月第几周："+calendar.get(Calendar.WEEK_OF_MONTH));

System.out.println("当年第几周："+calendar.get(Calendar.WEEK_OF_YEAR));

System.out.println(calendar.get(Calendar.DAY_OF_WEEK)-1);// 周减1

int hour_24 = calendar.get(Calendar.HOUR_OF_DAY);

int hour_12 = calendar.get(Calendar.HOUR);

int minute = calendar.get(Calendar.MINUTE);

int second = calendar.get(Calendar.SECOND);

System.out.println("24小时制 "+hour_24 +":"+ minute +":" + second);

System.out.println("12小时制 "+hour_12 +":"+ minute +":" + second);

System.out.println("当前时间："+dateformat.format(calendar.getTime()) + " || 毫秒数："+ calendar.getTimeInMillis());

calendar.add(Calendar.MONTH, 1);

System.out.println("下一月当前时间："+dateformat.format(calendar.getTime()) + " || 毫秒数："+ calendar.getTimeInMillis());

calendar.add(Calendar.WEEK_OF_MONTH, 1);

System.out.println("下一周当前时间：" + dateformat.format(calendar.getTime()) + " || 毫秒数："+ calendar.getTimeInMillis());

calendar.add(Calendar.YEAR, 1);

System.out.println("下一年当前时间：" + dateformat.format(calendar.getTime()) + " || 毫秒数："+ calendar.getTimeInMillis());

//System.out.println("季度开始时间 ： "+ dateformat.format(getCurrentQuarterStartTime()));

System.out.println("下一季度结果时间： " + dateformat.format(getCurrentQuarterEndTime(calendar.get(Calendar.MONTH)+4)));

}

public Date lastDayOfMonth(Date date) {

Calendar calendar = Calendar.getInstance();

calendar.setTime(date);

calendar.set(Calendar.DAY_OF_MONTH, 1);

calendar.roll(Calendar.DAY_OF_MONTH, -1);

return calendar.getTime();

}

/**

* 当前季度的开始时间

*/

public static Date getCurrentQuarterStartTime() {

SimpleDateFormat dateformat=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

Calendar c = Calendar.getInstance();

int currentMonth = c.get(Calendar.MONTH) + 1;

Date now = null;

try {

if (currentMonth >= 1 && currentMonth <= 3)

c.set(Calendar.MONTH, 0);

else if (currentMonth >= 4 && currentMonth <= 6)

c.set(Calendar.MONTH, 3);

else if (currentMonth >= 7 && currentMonth <= 9)

c.set(Calendar.MONTH, 6);

else if (currentMonth >= 10 && currentMonth <= 12)

c.set(Calendar.MONTH, 9);

c.set(Calendar.DATE, 1);

now = dateformat.parse(dateformat.format(c.getTime()) + " 00:00");

} catch (Exception e) {

e.printStackTrace();

}

return now;

}

/**

* 当前季度的结束时间

*/

public static Date getCurrentQuarterEndTime(int currentMonth) {

SimpleDateFormat dateformat=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

Calendar c = Calendar.getInstance();

Date now = null;

try {

if (currentMonth >= 1 && currentMonth <= 3) {

c.set(Calendar.MONTH, 2);

c.set(Calendar.DATE, 31);

} else if (currentMonth >= 4 && currentMonth <= 6) {

c.set(Calendar.MONTH, 5);

c.set(Calendar.DATE, 30);

} else if (currentMonth >= 7 && currentMonth <= 9) {

c.set(Calendar.MONTH, 8);

c.set(Calendar.DATE, 30);

} else if (currentMonth >= 10 && currentMonth <= 12) {

c.set(Calendar.MONTH, 11);

c.set(Calendar.DATE, 31);

}

now = dateformat.parse(dateformat.format(c.getTime()) + " 23:59");

} catch (Exception e) {

e.printStackTrace();

}

return now;

}

}

原文：http://www.cnblogs.com/shaoyu19900421/p/4489236.html