java常用日期處理
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 {
//用來全局控制 上一週，本週，下一週的週數變化
private int weeks = 0;
private int MaxDate;//一月最大天數
private int MaxYear;//一年最大天數
/**
* @param args
*/
public static void main(String[] args) {
TimeTest tt = new TimeTest();
System.out.println("獲取當天日期:"+tt.getNowTime("yyyy-MM-dd"));
System.out.println("獲取本週一日期:"+tt.getMondayOFWeek());
System.out.println("獲取本週日的日期~:"+tt.getCurrentWeekday());
System.out.println("獲取上週一日期:"+tt.getPreviousWeekday());
System.out.println("獲取上週日日期:"+tt.getPreviousWeekSunday());
System.out.println("獲取下週一日期:"+tt.getNextMonday());
System.out.println("獲取下週日日期:"+tt.getNextSunday());
System.out.println("獲得相應周的週六的日期:"+tt.getNowTime("yyyy-MM-dd"));
System.out.println("獲取本月第一天日期:"+tt.getFirstDayOfMonth());
System.out.println("獲取本月最後一天日期:"+tt.getDefaultDay());
System.out.println("獲取上月第一天日期:"+tt.getPreviousMonthFirst());
System.out.println("獲取上月最後一天的日期:"+tt.getPreviousMonthEnd());
System.out.println("獲取下月第一天日期:"+tt.getNextMonthFirst());
System.out.println("獲取下月最後一天日期:"+tt.getNextMonthEnd());
System.out.println("獲取本年的第一天日期:"+tt.getCurrentYearFirst());
System.out.println("獲取本年最後一天日期:"+tt.getCurrentYearEnd());
System.out.println("獲取去年的第一天日期:"+tt.getPreviousYearFirst());
System.out.println("獲取去年的最後一天日期:"+tt.getPreviousYearEnd());
System.out.println("獲取明年第一天日期:"+tt.getNextYearFirst());
System.out.println("獲取明年最後一天日期:"+tt.getNextYearEnd());
System.out.println("獲取本季度第一天到最後一天:"+tt.getThisSeasonTime(11));
System.out.println("獲取兩個日期之間間隔天數2008-12-1~2008-9.29:"+TimeTest.getTwoDay("2008-12-1","2008-9-29"));
}
/**
* 得到二個日期間的間隔天數
*/
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 + "";
}
/**
* 根據一個日期，返回是星期幾的字符串
*
* @param sdate
* @return
*/
public static String getWeek(String sdate) {
// 再轉換爲時間
Date date = TimeTest.strToDate(sdate);
Calendar c = Calendar.getInstance();
c.setTime(date);
// int hour=c.get(Calendar.DAY_OF_WEEK);
// hour中存的就是星期幾了，其範圍 1~7
// 1=星期日 7=星期六，其他類推
return new SimpleDateFormat("EEEE").format(c.getTime());
}
/**
* 將短時間格式字符串轉換爲時間 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;
}
/**
* 兩個時間之間的天數
*
* @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;
// 轉換爲標準時間
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;
}
// 計算當月最後一天,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);//設爲當前月的1號
lastDate.add(Calendar.MONTH,1);//加一個月，變爲下月的1號
lastDate.add(Calendar.DATE,-1);//減去一天，變爲當月最後一天
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);//設爲當前月的1號
lastDate.add(Calendar.MONTH,-1);//減一個月，變爲下月的1號
//lastDate.add(Calendar.DATE,-1);//減去一天，變爲當月最後一天
str=sdf.format(lastDate.getTime());
return str;
}
//獲取當月第一天
public String getFirstDayOfMonth(){
String str = "";
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate = Calendar.getInstance();
lastDate.set(Calendar.DATE,1);//設爲當前月的1號
str=sdf.format(lastDate.getTime());
return str;
}
// 獲得本週星期日的日期
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;
}
//獲取當天時間
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;
}
// 獲得當前日期與本週日相差的天數
private int getMondayPlus() {
Calendar cd = Calendar.getInstance();
// 獲得今天是一週的第幾天，星期日是第一天，星期二是第二天......
int dayOfWeek = cd.get(Calendar.DAY_OF_WEEK)-1; //因爲按中國禮拜一作爲第一天所以這裏減1
if (dayOfWeek == 1) {
return 0;
} else {
return 1 - dayOfWeek;
}
}
//獲得本週一的日期
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;
}
//獲得相應周的週六的日期
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;
}
// 獲得上週星期日的日期
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;
}
// 獲得上週星期一的日期
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;
}
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