java 周期时期计算

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;
    }
}