Java获取指定日期的实现方法总结

格式化日期String-->Date或者Data-->String

SimpleDateFormatsdf=newSimpleDateFormat("yyyy-MM-dd");
Datedate=sdf.parse("2009-11-04");//String-->Date

Stringsdate=sdf.format(date);//Data-->String===============================================================
packagecom.hefeng.test;
importjava.text.DateFormat;
importjava.text.ParsePosition;
importjava.text.SimpleDateFormat;
importjava.util.Calendar;
importjava.util.Date;
importjava.util.GregorianCalendar;
publicclassTimeTest{
//用来全局控制上一周，本周，下一周的周数变化
privateintweeks=0;
privateintMaxDate;//一月最大天数
privateintMaxYear;//一年最大天数
/**
*@paramargs
*/
publicstaticvoidmain(String[]args){
TimeTesttt=newTimeTest();

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

*/

publicstaticStringgetAfterMonth(intmonth){
Calendarc=Calendar.getInstance();//获得一个日历的实例
SimpleDateFormatsdf=newSimpleDateFormat("yyyy-MM-dd");
Datedate=null;
try{
date=sdf.parse("2009-11-04");//初始日期
}catch(Exceptione){

}
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
StringstrDate=sdf.format(c.getTime()));//的到你想要得6个月后的日期
returnstrDate;

}


/**
*得到二个日期间的间隔天数
*/
publicstaticStringgetTwoDay(Stringsj1,Stringsj2){
SimpleDateFormatmyFormatter=newSimpleDateFormat("yyyy-MM-dd");
longday=0;
try{
java.util.Datedate=myFormatter.parse(sj1);
java.util.Datemydate=myFormatter.parse(sj2);
day=(date.getTime()-mydate.getTime())/(24*60*60*1000);
}catch(Exceptione){
return"";
}
returnday+"";
}
/**
*根据一个日期，返回是星期几的字符串
*/
publicstaticStringgetWeek(Stringsdate){
//再转换为时间
Datedate=TimeTest.strToDate(sdate);
Calendarc=Calendar.getInstance();
c.setTime(date);
//inthour=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
returnnewSimpleDateFormat("EEEE").format(c.getTime());
}
/**
*将短时间格式字符串转换为时间yyyy-MM-dd
*/
publicstaticDatestrToDate(StringstrDate){
SimpleDateFormatformatter=newSimpleDateFormat("yyyy-MM-dd");
ParsePositionpos=newParsePosition(0);
Datestrtodate=formatter.parse(strDate,pos);
returnstrtodate;
}
/**
*两个时间之间的天数
*
*@paramdate1
*@paramdate2
*@return
*/
publicstaticlonggetDays(Stringdate1,Stringdate2){
if(date1==null||date1.equals(""))
return0;
if(date2==null||date2.equals(""))
return0;
//转换为标准时间
SimpleDateFormatmyFormatter=newSimpleDateFormat("yyyy-MM-dd");
java.util.Datedate=null;
java.util.Datemydate=null;
try{
date=myFormatter.parse(date1);
mydate=myFormatter.parse(date2);
}catch(Exceptione){
}
longday=(date.getTime()-mydate.getTime())/(24*60*60*1000);
returnday;
}
//计算当月最后一天,返回字符串
publicStringgetDefaultDay(){
Stringstr="";
SimpleDateFormatsdf=newSimpleDateFormat("yyyy-MM-dd");
CalendarlastDate=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());
returnstr;
}
//上月第一天
publicStringgetPreviousMonthFirst(){
Stringstr="";
SimpleDateFormatsdf=newSimpleDateFormat("yyyy-MM-dd");
CalendarlastDate=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());
returnstr;
}
//获取当月第一天
publicStringgetFirstDayOfMonth(){
Stringstr="";
SimpleDateFormatsdf=newSimpleDateFormat("yyyy-MM-dd");
CalendarlastDate=Calendar.getInstance();
lastDate.set(Calendar.DATE,1);//设为当前月的1号
str=sdf.format(lastDate.getTime());
returnstr;
}
//获得本周星期日的日期
publicStringgetCurrentWeekday(){
weeks=0;
intmondayPlus=this.getMondayPlus();
GregorianCalendarcurrentDate=newGregorianCalendar();
currentDate.add(GregorianCalendar.DATE,mondayPlus+6);
Datemonday=currentDate.getTime();
DateFormatdf=DateFormat.getDateInstance();
StringpreMonday=df.format(monday);
returnpreMonday;
}
//获取当天时间
publicStringgetNowTime(Stringdateformat){
Datenow=newDate();
SimpleDateFormatdateFormat=newSimpleDateFormat(dateformat);//可
以方便
地修改日期格式
Stringhehe=dateFormat.format(now);
returnhehe;
}
//获得当前日期与本周日相差的天数
privateintgetMondayPlus(){
Calendarcd=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......
intdayOfWeek=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){
return0;
}else{
return1-dayOfWeek;
}
}
//获得本周一的日期
publicStringgetMondayOFWeek(){
weeks=0;
intmondayPlus=this.getMondayPlus();
GregorianCalendarcurrentDate=newGregorianCalendar();
currentDate.add(GregorianCalendar.DATE,mondayPlus);
Datemonday=currentDate.getTime();
DateFormatdf=DateFormat.getDateInstance();
StringpreMonday=df.format(monday);
returnpreMonday;
}
//获得相应周的周六的日期
publicStringgetSaturday(){
intmondayPlus=this.getMondayPlus();
GregorianCalendarcurrentDate=newGregorianCalendar();
currentDate.add(GregorianCalendar.DATE,mondayPlus+7*weeks+6);
Datemonday=currentDate.getTime();
DateFormatdf=DateFormat.getDateInstance();
StringpreMonday=df.format(monday);
returnpreMonday;
}
//获得上周星期日的日期
publicStringgetPreviousWeekSunday(){
weeks=0;
weeks--;
intmondayPlus=this.getMondayPlus();
GregorianCalendarcurrentDate=newGregorianCalendar();
currentDate.add(GregorianCalendar.DATE,mondayPlus+weeks);
Datemonday=currentDate.getTime();
DateFormatdf=DateFormat.getDateInstance();
StringpreMonday=df.format(monday);
returnpreMonday;
}
//获得上周星期一的日期
publicStringgetPreviousWeekday(){
weeks--;
intmondayPlus=this.getMondayPlus();
GregorianCalendarcurrentDate=newGregorianCalendar();
currentDate.add(GregorianCalendar.DATE,mondayPlus+7*weeks);
Datemonday=currentDate.getTime();
DateFormatdf=DateFormat.getDateInstance();
StringpreMonday=df.format(monday);
returnpreMonday;
}
//获得下周星期一的日期
publicStringgetNextMonday(){
weeks++;
intmondayPlus=this.getMondayPlus();
GregorianCalendarcurrentDate=newGregorianCalendar();
currentDate.add(GregorianCalendar.DATE,mondayPlus+7);
Datemonday=currentDate.getTime();
DateFormatdf=DateFormat.getDateInstance();
StringpreMonday=df.format(monday);
returnpreMonday;
}
//获得下周星期日的日期
publicStringgetNextSunday(){
intmondayPlus=this.getMondayPlus();
GregorianCalendarcurrentDate=newGregorianCalendar();
currentDate.add(GregorianCalendar.DATE,mondayPlus+7+6);
Datemonday=currentDate.getTime();
DateFormatdf=DateFormat.getDateInstance();
StringpreMonday=df.format(monday);
returnpreMonday;
}
privateintgetMonthPlus(){
Calendarcd=Calendar.getInstance();
intmonthOfNumber=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{
return1-monthOfNumber;
}
}
//获得上月最后一天的日期
publicStringgetPreviousMonthEnd(){
Stringstr="";
SimpleDateFormatsdf=newSimpleDateFormat("yyyy-MM-dd");
CalendarlastDate=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());
returnstr;
}
//获得下个月第一天的日期
publicStringgetNextMonthFirst(){
Stringstr="";
SimpleDateFormatsdf=newSimpleDateFormat("yyyy-MM-dd");
CalendarlastDate=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());
returnstr;
}
//获得下个月最后一天的日期
publicStringgetNextMonthEnd(){
Stringstr="";
SimpleDateFormatsdf=newSimpleDateFormat("yyyy-MM-dd");
CalendarlastDate=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());
returnstr;
}
//获得明年最后一天的日期
publicStringgetNextYearEnd(){
Stringstr="";
SimpleDateFormatsdf=newSimpleDateFormat("yyyy-MM-dd");
CalendarlastDate=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());
returnstr;
}
//获得明年第一天的日期
publicStringgetNextYearFirst(){
Stringstr="";
SimpleDateFormatsdf=newSimpleDateFormat("yyyy-MM-dd");
CalendarlastDate=Calendar.getInstance();
lastDate.add(Calendar.YEAR,1);//加一个年
lastDate.set(Calendar.DAY_OF_YEAR,1);
str=sdf.format(lastDate.getTime());
returnstr;
}
//获得本年有多少天
privateintgetMaxYear(){
Calendarcd=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。
intMaxYear=cd.get(Calendar.DAY_OF_YEAR);
returnMaxYear;
}
privateintgetYearPlus(){
Calendarcd=Calendar.getInstance();
intyearOfNumber=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。
intMaxYear=cd.get(Calendar.DAY_OF_YEAR);
if(yearOfNumber==1){
return-MaxYear;
}else{
return1-yearOfNumber;
}
}
//获得本年第一天的日期
publicStringgetCurrentYearFirst(){
intyearPlus=this.getYearPlus();
GregorianCalendarcurrentDate=newGregorianCalendar();
currentDate.add(GregorianCalendar.DATE,yearPlus);
DateyearDay=currentDate.getTime();
DateFormatdf=DateFormat.getDateInstance();
StringpreYearDay=df.format(yearDay);
returnpreYearDay;
}
//获得本年最后一天的日期*
publicStringgetCurrentYearEnd(){
Datedate=newDate();
SimpleDateFormatdateFormat=newSimpleDateFormat("yyyy");//可以方
便地修
改日期格式
Stringyears=dateFormat.format(date);
returnyears+"-12-31";
}

//获得上年第一天的日期*
publicStringgetPreviousYearFirst(){
Datedate=newDate();
SimpleDateFormatdateFormat=newSimpleDateFormat("yyyy");//可以方
便地修
改日期格式
Stringyears=dateFormat.format(date);intyears_value=Integer.parseInt
(years);
years_value--;
returnyears_value+"-1-1";
}
//获得上年最后一天的日期
publicStringgetPreviousYearEnd(){
weeks--;
intyearPlus=this.getYearPlus();
GregorianCalendarcurrentDate=newGregorianCalendar();
currentDate.add(GregorianCalendar.DATE,yearPlus+MaxYear*weeks+(MaxYear-1));
DateyearDay=currentDate.getTime();
DateFormatdf=DateFormat.getDateInstance();
StringpreYearDay=df.format(yearDay);
getThisSeasonTime(11);
returnpreYearDay;
}
//获得本季度
publicStringgetThisSeasonTime(intmonth){
intarray[][]={{1,2,3},{4,5,6},{7,8,9},{10,11,12}};
intseason=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;
}
intstart_month=array[season-1][0];
intend_month=array[season-1][2];
Datedate=newDate();
SimpleDateFormatdateFormat=newSimpleDateFormat("yyyy");//可以方
便地修
改日期格式
Stringyears=dateFormat.format(date);
intyears_value=Integer.parseInt(years);
intstart_days=1;//years+"-"+String.valueOf(start_month)+"-
";//getLastDayOfMonth(years_value,start_month);
intend_days=getLastDayOfMonth(years_value,end_month);
StringseasonDate=
years_value+"-"+start_month+"-"+start_days+";"+years_value+"-"+end_month+"-"+end_days;
returnseasonDate;
}
/**
*获取某年某月的最后一天
*@paramyear年
*@parammonth月
*@return最后一天
*/
privateintgetLastDayOfMonth(intyear,intmonth){
if(month==1||month==3||month==5||month==7||month==8
||month==10||month==12){
return31;
}
if(month==4||month==6||month==9||month==11){
return30;
}
if(month==2){
if(isLeapYear(year)){
return29;
}else{
return28;
}
}
return0;
}
/**
*是否闰年
*@paramyear年
*@return
*/
publicbooleanisLeapYear(intyear){
return(year%4==0&&year%100!=0)||(year%400==0);
}