java獲取各種時間

package com.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; 
} 

// 獲得下週星期一的日期 
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; 
} 

// 獲得下週星期日的日期 
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 ); //把日期設置爲當月第一天 
cd.roll(Calendar.DATE, - 1 ); //日期回滾一天,也就是最後一天 
MaxDate=cd.get(Calendar.DATE); 
if (monthOfNumber == 1 ){ 
return -MaxDate; 
} else { 
return 1 -monthOfNumber; 
} 
} 

//獲得上月最後一天的日期 
public String getPreviousMonthEnd(){ 
String str = "" ; 
SimpleDateFormat sdf= new SimpleDateFormat( "yyyy-MM-dd" ); 

Calendar lastDate = Calendar.getInstance(); 
lastDate.add(Calendar.MONTH,- 1 ); //減一個月 
lastDate.set(Calendar.DATE, 1 ); //把日期設置爲當月第一天 
lastDate.roll(Calendar.DATE, - 1 ); //日期回滾一天,也就是本月最後一天 
str=sdf.format(lastDate.getTime()); 
return str; 
} 

//獲得下個月第一天的日期 
public String getNextMonthFirst(){ 
String str = "" ; 
SimpleDateFormat sdf= new SimpleDateFormat( "yyyy-MM-dd" ); 

Calendar lastDate = Calendar.getInstance(); 
lastDate.add(Calendar.MONTH, 1 ); //減一個月 
lastDate.set(Calendar.DATE, 1 ); //把日期設置爲當月第一天 
str=sdf.format(lastDate.getTime()); 
return str; 
} 

//獲得下個月最後一天的日期 
public String getNextMonthEnd(){ 
String str = "" ; 
SimpleDateFormat sdf= new SimpleDateFormat( "yyyy-MM-dd" ); 

Calendar lastDate = Calendar.getInstance(); 
lastDate.add(Calendar.MONTH, 1 ); //加一個月 
lastDate.set(Calendar.DATE, 1 ); //把日期設置爲當月第一天 
lastDate.roll(Calendar.DATE, - 1 ); //日期回滾一天,也就是本月最後一天 
str=sdf.format(lastDate.getTime()); 
return str; 
} 

//獲得明年最後一天的日期 
public String getNextYearEnd(){ 
String str = "" ; 
SimpleDateFormat sdf= new SimpleDateFormat( "yyyy-MM-dd" ); 

Calendar lastDate = Calendar.getInstance(); 
lastDate.add(Calendar.YEAR, 1 ); //加一個年 
lastDate.set(Calendar.DAY_OF_YEAR, 1 ); 
lastDate.roll(Calendar.DAY_OF_YEAR, - 1 ); 
str=sdf.format(lastDate.getTime()); 
return str; 
} 

//獲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 ); //加一個年 
lastDate.set(Calendar.DAY_OF_YEAR, 1 ); 
str=sdf.format(lastDate.getTime()); 
return str; 

} 

//獲得本年有多少天 
private int getMaxYear(){ 
Calendar cd = Calendar.getInstance(); 
cd.set(Calendar.DAY_OF_YEAR, 1 ); //把日期設爲當年第一天 
cd.roll(Calendar.DAY_OF_YEAR,- 1 ); //把日期回滾一天。 
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); //獲得當天是一年中的第幾天 
cd.set(Calendar.DAY_OF_YEAR, 1 ); //把日期設爲當年第一天 
cd.roll(Calendar.DAY_OF_YEAR,- 1 ); //把日期回滾一天。 
int MaxYear = cd.get(Calendar.DAY_OF_YEAR); 
if (yearOfNumber == 1 ){ 
return -MaxYear; 
} else { 
return 1 -yearOfNumber; 
} 
} 
//獲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; 
} 


//獲得本年最後一天的日期 * 
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" ; 
} 


//獲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" ; 
} 

//獲得上年最後一天的日期 
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; 
} 

//獲得本季度 
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; 

} 

/** 
* 獲取某年某月的最後一天 
* @param year 年 
* @param month 月 
* @return 最後一天 
*/ 
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; 
} 
/** 
* 是否閏年 
* @param year 年 
* @return 
*/ 
public boolean isLeapYear(int year) { 
return (year % 4 == 0 &;&; year % 100 != 0) || (year % 400 == 0); 
} 
}