总结Java 获取指定日期的操作步骤

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  程序员有时为了解决性能问题,要记录完成操作所需的时间,我们可以使用系统类的的方法进行返回,本文是爱站技术频道小编为大家介绍的总结 获取指定日期的操作步骤,一起来学习吧!    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-  .29:"+TimeTest.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 = 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)+"-  ";//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);  }

  其实学习这方面的知识并不难,也有很多方法,难的是你并没有一颗想要学习的心,爱站技术频道小编提供了总结Java 获取指定日期的操作步骤,充分利用他们,相信你可以成功。 

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