Java 获取各种日期

package org.siming.imManager.utils;

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


public class DateUtils {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println("当天24点时间：" + getTimesnight().toLocaleString());
        System.out.println("当前时间：" + new Date().toLocaleString());
        System.out.println("当天0点时间：" + getTimesmorning().toLocaleString());
        System.out.println("昨天0点时间：" + getYesterdaymorning().toLocaleString());
        System.out.println("近7天时间：" + getWeekFromNow().toLocaleString());
        System.out.println("本周周一0点时间：" + getTimesWeekmorning().toLocaleString());
        System.out.println("本周周日24点时间：" + getTimesWeeknight().toLocaleString());
        System.out.println("本月初0点时间：" + getTimesMonthmorning().toLocaleString());
        System.out.println("本月未24点时间：" + getTimesMonthnight().toLocaleString());
        System.out.println("上月初0点时间：" + getLastMonthStartMorning().toLocaleString());
        System.out.println("本季度开始点时间：" + getCurrentQuarterStartTime().toLocaleString());
        System.out.println("本季度结束点时间：" + getCurrentQuarterEndTime().toLocaleString());
        System.out.println("本年开始点时间：" + getCurrentYearStartTime().toLocaleString());
        System.out.println("本年结束点时间：" + getCurrentYearEndTime().toLocaleString());
        System.out.println("上年开始点时间：" + getLastYearStartTime().toLocaleString());
    }

    // 获得当天0点时间
    public static Date getTimesmorning() {
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.MILLISECOND, 0);
        return cal.getTime();


    }
    // 获得昨天0点时间
    public static Date getYesterdaymorning() {
        Calendar cal = Calendar.getInstance();
        cal.setTimeInMillis(getTimesmorning().getTime()-3600*24*1000);
        return cal.getTime();
    }
    // 获得当天近7天时间
    public static Date getWeekFromNow() {
        Calendar cal = Calendar.getInstance();
        cal.setTimeInMillis( getTimesmorning().getTime()-3600*24*1000*7);
        return cal.getTime();
    }

    // 获得当天24点时间
    public static Date getTimesnight() {
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.HOUR_OF_DAY, 24);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.MILLISECOND, 0);
        return cal.getTime();
    }

    // 获得本周一0点时间
    public static Date getTimesWeekmorning() {
        Calendar cal = Calendar.getInstance();
        cal.set(cal.get(Calendar.YEAR), cal.get(Calendar.MONDAY), cal.get(Calendar.DAY_OF_MONTH), 0, 0, 0);
        cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
        return cal.getTime();
    }

    // 获得本周日24点时间
    public static Date getTimesWeeknight() {
        Calendar cal = Calendar.getInstance();
        cal.setTime(getTimesWeekmorning());
        cal.add(Calendar.DAY_OF_WEEK, 7);
        return cal.getTime();
    }

    // 获得本月第一天0点时间
    public static Date getTimesMonthmorning() {
        Calendar cal = Calendar.getInstance();
        cal.set(cal.get(Calendar.YEAR), cal.get(Calendar.MONDAY), cal.get(Calendar.DAY_OF_MONTH), 0, 0, 0);
        cal.set(Calendar.DAY_OF_MONTH, cal.getActualMinimum(Calendar.DAY_OF_MONTH));
        return cal.getTime();
    }

    // 获得本月最后一天24点时间
    public static Date getTimesMonthnight() {
        Calendar cal = Calendar.getInstance();
        cal.set(cal.get(Calendar.YEAR), cal.get(Calendar.MONDAY), cal.get(Calendar.DAY_OF_MONTH), 0, 0, 0);
        cal.set(Calendar.DAY_OF_MONTH, cal.getActualMaximum(Calendar.DAY_OF_MONTH));
        cal.set(Calendar.HOUR_OF_DAY, 24);
        return cal.getTime();
    }

    public static Date getLastMonthStartMorning() {
        Calendar cal = Calendar.getInstance();
        cal.setTime(getTimesMonthmorning());
        cal.add(Calendar.MONTH, -1);
        return cal.getTime();
    }

    public static Date getCurrentQuarterStartTime() {
        Calendar c = Calendar.getInstance();
        int currentMonth = c.get(Calendar.MONTH) + 1;
        SimpleDateFormat longSdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        SimpleDateFormat shortSdf = new SimpleDateFormat("yyyy-MM-dd");
        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, 4);
            else if (currentMonth >= 10 && currentMonth <= 12)
                c.set(Calendar.MONTH, 9);
            c.set(Calendar.DATE, 1);
            now = longSdf.parse(shortSdf.format(c.getTime()) + " 00:00:00");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return now;
    }

    /**
     * 当前季度的结束时间，即2012-03-31 23:59:59
     *
     * @return
     */
    public static Date getCurrentQuarterEndTime() {
        Calendar cal = Calendar.getInstance();
        cal.setTime(getCurrentQuarterStartTime());
        cal.add(Calendar.MONTH, 3);
        return cal.getTime();
    }


    public static Date getCurrentYearStartTime() {
        Calendar cal = Calendar.getInstance();
        cal.set(cal.get(Calendar.YEAR), cal.get(Calendar.MONDAY), cal.get(Calendar.DAY_OF_MONTH), 0, 0, 0);
        cal.set(Calendar.DAY_OF_MONTH, cal.getActualMinimum(Calendar.YEAR));
        return cal.getTime();
    }

    public static Date getCurrentYearEndTime() {
        Calendar cal = Calendar.getInstance();
        cal.setTime(getCurrentYearStartTime());
        cal.add(Calendar.YEAR, 1);
        return cal.getTime();
    }

    public static Date getLastYearStartTime() {
        Calendar cal = Calendar.getInstance();
        cal.setTime(getCurrentYearStartTime());
        cal.add(Calendar.YEAR, -1);
        return cal.getTime();
    }

}