Java获取各种常用时间方法
本人之前做的项目中积累常用的时间方法,贴出来与大家共享,如果哪里有错误或更有效的方法请尽管拍砖!哈哈
Java代码![复制代码](http://www.javaeye.com/images/icon_copy.gif)
Java代码
![复制代码](http://www.javaeye.com/images/icon_copy.gif)
- 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("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("获得相应周的周六的日期:"+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
- *
- * @param sdate
- * @return
- */
- 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
- *
- * @param strDate
- * @return
- */
- 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;
- }