Java 获取指定日期的实现方法总结

http://my.oschina.net/sniperLi/blog/488570
格式化日期 String-->Date  或者 Data-->String
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");  
Date  date = sdf.parse("2009-11-04");//String-->Date 
String  sdate  = sdf.format(date );// Data-->String ===============================================================

package com.pandy.test;

import java.text.DateFormat;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

/**
 * 项目名称: wp_idea_linux
 * 功能说明:
 * 创建者: Pandy,
 * 邮箱: [email protected], [email protected]
 * 版权:
 * 官网:
 * 创建日期: 15-8-9.
 * 创建时间: 下午4:23.
 * 修改历史:
 * -----------------------------------------------
 */


public class DateTest {
    //用来全局控制 上一周，本周，下一周的周数变化
    private int weeks = 0;
    private int MaxDate;//一月最大天数
    private int MaxYear;//一年最大天数

    /**
     * @param args
     */
    public static void main(String[] args) {
        DateTest tt = new DateTest();
        System.out.println("得到6个月后的日期:" + tt.getAfterMonth(6));
        System.out.println("获取当天日期:" + tt.getNowTime("yyyy-MM-dd"));
        System.out.println("获取本周一日期:" + tt.getMondayOFWeek());
        System.out.println("获取本周日的日期~:" + tt.getCurrentWeekday());
        System.out.println("获取上周一日期:" + tt.getPreviousWeekday());
        System.out.println("获取上周日日期:" + tt.getPreviousWeekSunday());
        System.out.println("获取下周一日期:" + tt.getNextMonday());
        System.out.println("获取下周日日期:" + tt.getNextSunday());
        System.out.println("获得相应周的周六:" + tt.getNowTime("yyyy-MM-dd"));
        System.out.println("获取本月第一天日期:" + tt.getFirstDayOfMonth());
        System.out.println("获取本月最后一天日期:" + tt.getDefaultDay());
        System.out.println("获取上月第一天日期:" + tt.getPreviousMonthFirst());
        System.out.println("获取上月最后一天的日期:" + tt.getPreviousMonthEnd());
        System.out.println("获取下月第一天日期:" + tt.getNextMonthFirst());
        System.out.println("获取下月最后一天日期:" + tt.getNextMonthEnd());
        System.out.println("获取本年的第一天日期:" + tt.getCurrentYearFirst());
        System.out.println("获取本年最后一天日期:" + tt.getCurrentYearEnd());
        System.out.println("获取去年的第一天日期:" + tt.getPreviousYearFirst());
        System.out.println("获取去年的最后一天日期:" + tt.getPreviousYearEnd());
        System.out.println("获取明年第一天日期:" + tt.getNextYearFirst());
        System.out.println("获取明年最后一天日期:" + tt.getNextYearEnd());
        System.out.println("获取本季度第一天到最后一天:" + tt.getThisSeasonTime(11));
        System.out.println("获取两个日期之间间隔天数2008-12-1~2008-.29:" + DateTest.getTwoDay("2008-12-1", "2008-9-29"));
    }

    /**
     * 得到指定月后（前）的日期 参数传负数即可
     */
    public static String getAfterMonth(int month) {
        Calendar c = Calendar.getInstance();//获得一个日历的实例
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Date date = null;
        try {
            date = sdf.parse("2009-11-04");//初始日期
        } catch (Exception e) {
        }
        c.setTime(date);//设置日历时间
        c.add(Calendar.MONTH, month);//在日历的月份上增加6个月
        String strDate = sdf.format(c.getTime());//的到你想要得6个月后的日期
        return strDate;
    }

    /**
     * 得到二个日期间的间隔天数
     */
    public static String getTwoDay(String sj1, String sj2) {
        SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
        long day = 0;
        try {
            java.util.Date date = myFormatter.parse(sj1);
            java.util.Date mydate = myFormatter.parse(sj2);
            day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);
        } catch (Exception e) {
            return "";
        }
        return day + "";
    }

    /**
     * 根据一个日期，返回是星期几的字符串
     */
    public static String getWeek(String sdate) {
// 再转换为时间
        Date date = DateTest.strToDate(sdate);
        Calendar c = Calendar.getInstance();
        c.setTime(date);
// int hour=c.get(Calendar.DAY_OF_WEEK);
// hour 中存的就是星期几了，其范围 1~7
// 1=星期日 7=星期六，其他类推
        return new SimpleDateFormat("EEEE").format(c.getTime());
    }

    /**
     * 将短时间格式字符串转换为时间 yyyy-MM-dd
     */
    public static Date strToDate(String strDate) {
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
        ParsePosition pos = new ParsePosition(0);
        Date strtodate = formatter.parse(strDate, pos);
        return strtodate;
    }

    /**
     * 两个时间之间的天数
     *
     * @param date1
     * @param date2
     * @return
     */
    public static long getDays(String date1, String date2) {
        if (date1 == null || date1.equals(""))
            return 0;
        if (date2 == null || date2.equals(""))
            return 0;
// 转换为标准时间
        SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
        java.util.Date date = null;
        java.util.Date mydate = null;
        try {
            date = myFormatter.parse(date1);
            mydate = myFormatter.parse(date2);
        } catch (Exception e) {
        }
        long day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);
        return day;
    }

    // 计算当月最后一天,返回字符串
    public String getDefaultDay() {
        String str = "";
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Calendar lastDate = Calendar.getInstance();
        lastDate.set(Calendar.DATE, 1);//设为当前月的1 号
        lastDate.add(Calendar.MONTH, 1);//加一个月，变为下月的1 号
        lastDate.add(Calendar.DATE, -1);//减去一天，变为当月最后一天
        str = sdf.format(lastDate.getTime());
        return str;
    }

    // 上月第一天
    public String getPreviousMonthFirst() {
        String str = "";
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Calendar lastDate = Calendar.getInstance();
        lastDate.set(Calendar.DATE, 1);//设为当前月的1 号
        lastDate.add(Calendar.MONTH, -1);//减一个月，变为下月的1 号
//lastDate.add(Calendar.DATE,-1);//减去一天，变为当月最后一天
        str = sdf.format(lastDate.getTime());
        return str;
    }

    //获取当月第一天
    public String getFirstDayOfMonth() {
        String str = "";
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Calendar lastDate = Calendar.getInstance();
        lastDate.set(Calendar.DATE, 1);//设为当前月的1 号
        str = sdf.format(lastDate.getTime());
        return str;
    }

    // 获得本周星期日的日期
    public String getCurrentWeekday() {
        weeks = 0;
        int mondayPlus = this.getMondayPlus();
        GregorianCalendar currentDate = new GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus + 6);
        Date monday = currentDate.getTime();
        DateFormat df = DateFormat.getDateInstance();
        String preMonday = df.format(monday);
        return preMonday;
    }

    //获取当天时间
    public String getNowTime(String dateformat) {
        Date now = new Date();
        SimpleDateFormat dateFormat = new SimpleDateFormat(dateformat);//可以方便地修改日期格式
        String hehe = dateFormat.format(now);
        return hehe;
    }

    // 获得当前日期与本周日相差的天数
    private int getMondayPlus() {
        Calendar cd = Calendar.getInstance();
// 获得今天是一周的第几天，星期日是第一天，星期二是第二天......
        int dayOfWeek = cd.get(Calendar.DAY_OF_WEEK) - 1; //因为按中国礼拜一作为第一天所以这里减1
        if (dayOfWeek == 1) {
            return 0;
        } else {
            return 1 - dayOfWeek;
        }
    }

    //获得本周一的日期
    public String getMondayOFWeek() {
        weeks = 0;
        int mondayPlus = this.getMondayPlus();
        GregorianCalendar currentDate = new GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus);
        Date monday = currentDate.getTime();
        DateFormat df = DateFormat.getDateInstance();
        String preMonday = df.format(monday);
        return preMonday;
    }

    //获得相应周的周六的日期
    public String getSaturday() {
        int mondayPlus = this.getMondayPlus();
        GregorianCalendar currentDate = new GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks + 6);
        Date monday = currentDate.getTime();
        DateFormat df = DateFormat.getDateInstance();
        String preMonday = df.format(monday);
        return preMonday;
    }

    // 获得上周星期日的日期
    public String getPreviousWeekSunday() {
        weeks = 0;
        weeks--;
        int mondayPlus = this.getMondayPlus();
        GregorianCalendar currentDate = new GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus + weeks);
        Date monday = currentDate.getTime();
        DateFormat df = DateFormat.getDateInstance();
        String preMonday = df.format(monday);
        return preMonday;
    }

    // 获得上周星期一的日期
    public String getPreviousWeekday() {
        weeks--;
        int mondayPlus = this.getMondayPlus();
        GregorianCalendar currentDate = new GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks);
        Date monday = currentDate.getTime();
        DateFormat df = DateFormat.getDateInstance();
        String preMonday = df.format(monday);
        return preMonday;
    }

    // 获得下周星期一的日期
    public String getNextMonday() {
        weeks++;
        int mondayPlus = this.getMondayPlus();
        GregorianCalendar currentDate = new GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus + 7);
        Date monday = currentDate.getTime();
        DateFormat df = DateFormat.getDateInstance();
        String preMonday = df.format(monday);
        return preMonday;
    }

    // 获得下周星期日的日期
    public String getNextSunday() {
        int mondayPlus = this.getMondayPlus();
        GregorianCalendar currentDate = new GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 + 6);
        Date monday = currentDate.getTime();
        DateFormat df = DateFormat.getDateInstance();
        String preMonday = df.format(monday);
        return preMonday;
    }

    private int getMonthPlus() {
        Calendar cd = Calendar.getInstance();
        int monthOfNumber = cd.get(Calendar.DAY_OF_MONTH);
        cd.set(Calendar.DATE, 1);//把日期设置为当月第一天
        cd.roll(Calendar.DATE, -1);//日期回滚一天，也就是最后一天
        MaxDate = cd.get(Calendar.DATE);
        if (monthOfNumber == 1) {
            return -MaxDate;
        } else {
            return 1 - monthOfNumber;
        }
    }

    //获得上月最后一天的日期
    public String getPreviousMonthEnd() {
        String str = "";
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Calendar lastDate = Calendar.getInstance();
        lastDate.add(Calendar.MONTH, -1);//减一个月
        lastDate.set(Calendar.DATE, 1);//把日期设置为当月第一天
        lastDate.roll(Calendar.DATE, -1);//日期回滚一天，也就是本月最后一天
        str = sdf.format(lastDate.getTime());
        return str;
    }

    //获得下个月第一天的日期
    public String getNextMonthFirst() {
        String str = "";
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Calendar lastDate = Calendar.getInstance();
        lastDate.add(Calendar.MONTH, 1);//减一个月
        lastDate.set(Calendar.DATE, 1);//把日期设置为当月第一天
        str = sdf.format(lastDate.getTime());
        return str;
    }

    //获得下个月最后一天的日期
    public String getNextMonthEnd() {
        String str = "";
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Calendar lastDate = Calendar.getInstance();
        lastDate.add(Calendar.MONTH, 1);//加一个月
        lastDate.set(Calendar.DATE, 1);//把日期设置为当月第一天
        lastDate.roll(Calendar.DATE, -1);//日期回滚一天，也就是本月最后一天
        str = sdf.format(lastDate.getTime());
        return str;
    }

    //获得明年最后一天的日期
    public String getNextYearEnd() {
        String str = "";
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Calendar lastDate = Calendar.getInstance();
        lastDate.add(Calendar.YEAR, 1);//加一个年
        lastDate.set(Calendar.DAY_OF_YEAR, 1);
        lastDate.roll(Calendar.DAY_OF_YEAR, -1);
        str = sdf.format(lastDate.getTime());
        return str;
    }

    //获得明年第一天的日期
    public String getNextYearFirst() {
        String str = "";
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Calendar lastDate = Calendar.getInstance();
        lastDate.add(Calendar.YEAR, 1);//加一个年
        lastDate.set(Calendar.DAY_OF_YEAR, 1);
        str = sdf.format(lastDate.getTime());
        return str;
    }

    //获得本年有多少天
    private int getMaxYear() {
        Calendar cd = Calendar.getInstance();
        cd.set(Calendar.DAY_OF_YEAR, 1);//把日期设为当年第一天
        cd.roll(Calendar.DAY_OF_YEAR, -1);//把日期回滚一天。
        int MaxYear = cd.get(Calendar.DAY_OF_YEAR);
        return MaxYear;
    }

    private int getYearPlus() {
        Calendar cd = Calendar.getInstance();
        int yearOfNumber = cd.get(Calendar.DAY_OF_YEAR);//获得当天是一年中的第几天
        cd.set(Calendar.DAY_OF_YEAR, 1);//把日期设为当年第一天
        cd.roll(Calendar.DAY_OF_YEAR, -1);//把日期回滚一天。
        int MaxYear = cd.get(Calendar.DAY_OF_YEAR);
        if (yearOfNumber == 1) {
            return -MaxYear;
        } else {
            return 1 - yearOfNumber;
        }
    }

    //获得本年第一天的日期
    public String getCurrentYearFirst() {
        int yearPlus = this.getYearPlus();
        GregorianCalendar currentDate = new GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, yearPlus);
        Date yearDay = currentDate.getTime();
        DateFormat df = DateFormat.getDateInstance();
        String preYearDay = df.format(yearDay);
        return preYearDay;
    }

    //获得本年最后一天的日期 *
    public String getCurrentYearEnd() {
        Date date = new Date();
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");//可以方便地修改日期格式
        String years = dateFormat.format(date);
        return years + "-12-31";
    }

    //获得上年第一天的日期 *
    public String getPreviousYearFirst() {
        Date date = new Date();
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");//可以方便地修改日期格式
        String years = dateFormat.format(date);
        int years_value = Integer.parseInt
                (years);
        years_value--;
        return years_value + "-1-1";
    }

    //获得上年最后一天的日期
    public String getPreviousYearEnd() {
        weeks--;
        int yearPlus = this.getYearPlus();
        GregorianCalendar currentDate = new GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, yearPlus + MaxYear * weeks + (MaxYear - 1));
        Date yearDay = currentDate.getTime();
        DateFormat df = DateFormat.getDateInstance();
        String preYearDay = df.format(yearDay);
        getThisSeasonTime(11);
        return preYearDay;
    }

    //获得本季度
    public String getThisSeasonTime(int month) {
        int array[][] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}, {10, 11, 12}};
        int season = 1;
        if (month >= 1 && month <= 3) {
            season = 1;
        }
        if (month >= 4 && month <= 6) {
            season = 2;
        }
        if (month >= 7 && month <= 9) {
            season = 3;
        }
        if (month >= 10 && month <= 12) {
            season = 4;
        }
        int start_month = array[season - 1][0];
        int end_month = array[season - 1][2];
        Date date = new Date();
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");//可以方便地修改日期格式
        String years = dateFormat.format(date);
        int years_value = Integer.parseInt(years);
        int start_days = 1;//years+"-"+String.valueOf(start_month)+"-";//getLastDayOfMonth(years_value,start_month);
        int end_days = getLastDayOfMonth(years_value, end_month);
        String seasonDate =
                years_value + "-" + start_month + "-" + start_days + ";" + years_value + "-" + end_month + "-" + end_days;
        return seasonDate;
    }

    /**
     * 获取某年某月的最后一天
     *
     * @param year  年
     * @param month 月
     * @return 最后一天
     */
    private int getLastDayOfMonth(int year, int month) {
        if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8
                || month == 10 || month == 12) {
            return 31;
        }
        if (month == 4 || month == 6 || month == 9 || month == 11) {
            return 30;
        }
        if (month == 2) {
            if (isLeapYear(year)) {
                return 29;
            } else {
                return 28;
            }
        }
        return 0;
    }

    /**
     * 是否闰年
     *
     * @param year 年
     * @return
     */
    public boolean isLeapYear(int year) {
        return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
    }
}

得到6个月后的日期:2010-05-04
获取当天日期:2015-08-09
获取本周一日期:2015-8-10
获取本周日的日期~:2015-8-16
获取上周一日期:2015-8-3
获取上周日日期:2015-8-9
获取下周一日期:2015-8-17
获取下周日日期:2015-8-23
获得相应周的周六:2015-08-09
获取本月第一天日期:2015-08-01
获取本月最后一天日期:2015-08-31
获取上月第一天日期:2015-07-01
获取上月最后一天的日期:2015-07-31
获取下月第一天日期:2015-09-01
获取下月最后一天日期:2015-09-30
获取本年的第一天日期:2015-1-1
获取本年最后一天日期:2015-12-31
获取去年的第一天日期:2014-1-1
获取去年的最后一天日期:2014-12-31
获取明年第一天日期:2016-01-01
获取明年最后一天日期:2016-12-31
获取本季度第一天到最后一天:2015-10-1;2015-12-31
获取两个日期之间间隔天数2008-12-1~2008-.29:63