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java获取指定日期的方法总结


 

   

  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.hefeng.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;

  public class TimeTest {

  //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) {

  TimeTest tt = new TimeTest();

  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-

  9.29:"+TimeTest.getTwoDay("2008-12-1","2008-9-29"));

  }

  /**

  * 得到指定月后的日期

  */

  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 = TimeTest.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)+"-

  1";//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;

  }

  public boolean isLeapYear(int year) {

  return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);

  }