JAva日付Date操作まとめ
1:
Java日付Dateクラスを減算し、年を減算し、月を減算
Java日付Dateクラスを減算し、年を減算し、月を減算
/**
*
* @param date 》》“20140103”
* @param addYears X X， X -X， 0；
* @param addMonths X X， X -X， 0；
* @param addDays X X， X -X， 0；
* @param dateFormat 》》“yyyyMMdd”；
* @return
* @author JiaRH
* @Date 2014/01/03 09:50
*/
public static String getDate(String date,int addYears,int addMonths,int addDays,String dateFormat){
SimpleDateFormat sdf=new SimpleDateFormat(dateFormat);
Date dt;
try {
dt = sdf.parse(date);
Calendar calendar = Calendar.getInstance();
calendar.setTime(dt);
calendar.add(Calendar.YEAR,addYears);
calendar.add(Calendar.MONTH,addMonths);
calendar.add(Calendar.DAY_OF_YEAR,addDays);
Date newDate=calendar.getTime();
return sdf.format(newDate);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
2：// ， ，
private int weeks = 0;
private int MaxDate;//
private int MaxYear;//
public static void main(String[] args) {
MyTestDate tt = new MyTestDate();
System.out.println(" :" + tt.getNowTime("yyyy-MM-dd"));
System.out.println(" :" + tt.getMondayOFWeek());
System.out.println(" ~:" + tt.getCurrentWeekday());
System.out.println(" :" + tt.getPreviousWeekday());
System.out.println(" :" + tt.getPreviousWeekSunday());
System.out.println(" :" + tt.getNextMonday());
System.out.println(" :" + tt.getNextSunday());
System.out.println(" :" + tt.getNowTime("yyyy-MM-dd"));
System.out.println(" :" + tt.getFirstDayOfMonth());
System.out.println(" :" + tt.getDefaultDay());
System.out.println(" :" + tt.getPreviousMonthFirst());
System.out.println(" :" + tt.getPreviousMonthEnd());
System.out.println(" :" + tt.getNextMonthFirst());
System.out.println(" :" + tt.getNextMonthEnd());
System.out.println(" :" + tt.getCurrentYearFirst());
System.out.println(" :" + tt.getCurrentYearEnd());
System.out.println(" :" + tt.getPreviousYearFirst());
System.out.println(" :" + tt.getPreviousYearEnd());
System.out.println(" :" + tt.getNextYearFirst());
System.out.println(" :" + tt.getNextYearEnd());
System.out.println(" :" + tt.getThisSeasonTime(11));
System.out.println(" 2008-12-1~2008-9.29:"
+ MyTestDate.getTwoDay("2008-12-1", "2008-9-29"));
}
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 + "";
}
public static String getWeek(String sdate) {
//
Date date = MyTestDate.strToDate(sdate);
Calendar c = Calendar.getInstance();
c.setTime(date);
// int hour=c.get(Calendar.DAY_OF_WEEK);
// hour ， 1~7
// 1= 7= ，
return new SimpleDateFormat("EEEE").format(c.getTime());
}
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;
}
public static long getDays(String date1, String date2) {
if (date1 == null || date1.equals(""))
return 0;
if (date2 == null || date2.equals(""))
return 0;
//
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;
}
// ,
public String getDefaultDay() {
String str = "";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate = Calendar.getInstance();
lastDate.set(Calendar.DATE, 1);// 1
lastDate.add(Calendar.MONTH, 1);// ， 1
lastDate.add(Calendar.DATE, -1);// ，
str = sdf.format(lastDate.getTime());
return str;
}
//
public String getPreviousMonthFirst() {
String str = "";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate = Calendar.getInstance();
lastDate.set(Calendar.DATE, 1);// 1
lastDate.add(Calendar.MONTH, -1);// ， 1
// lastDate.add(Calendar.DATE,-1);// ，
str = sdf.format(lastDate.getTime());
return str;
}
//
public String getFirstDayOfMonth() {
String str = "";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate = Calendar.getInstance();
lastDate.set(Calendar.DATE, 1);// 1
str = sdf.format(lastDate.getTime());
return str;
}
//
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;
}
//
public String getNowTime(String dateformat) {
Date now = new Date();
SimpleDateFormat dateFormat = new SimpleDateFormat(dateformat);//
String hehe = dateFormat.format(now);
return hehe;
}
//
private int getMondayPlus() {
Calendar cd = Calendar.getInstance();
// ， ， ......
int dayOfWeek = cd.get(Calendar.DAY_OF_WEEK) - 1; // 1
if (dayOfWeek == 1) {
return 0;
} else {
return 1 - dayOfWeek;
}
}
//
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;
}
//
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;
}
//
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;
}
//
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;
}
//
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;
}
//
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);//
cd.roll(Calendar.DATE, -1);// ，
MaxDate = cd.get(Calendar.DATE);
if (monthOfNumber == 1) {
return -MaxDate;
} else {
return 1 - monthOfNumber;
}
}
//
public String getPreviousMonthEnd() {
String str = "";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate = Calendar.getInstance();
lastDate.add(Calendar.MONTH, -1);//
lastDate.set(Calendar.DATE, 1);//
lastDate.roll(Calendar.DATE, -1);// ，
str = sdf.format(lastDate.getTime());
return str;
}
//
public String getNextMonthFirst() {
String str = "";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate = Calendar.getInstance();
lastDate.add(Calendar.MONTH, 1);//
lastDate.set(Calendar.DATE, 1);//
str = sdf.format(lastDate.getTime());
return str;
}
//
public String getNextMonthEnd() {
String str = "";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate = Calendar.getInstance();
lastDate.add(Calendar.MONTH, 1);//
lastDate.set(Calendar.DATE, 1);//
lastDate.roll(Calendar.DATE, -1);// ，
str = sdf.format(lastDate.getTime());
return str;
}
//
public String getNextYearEnd() {
String str = "";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate = Calendar.getInstance();
lastDate.add(Calendar.YEAR, 1);//
lastDate.set(Calendar.DAY_OF_YEAR, 1);
lastDate.roll(Calendar.DAY_OF_YEAR, -1);
str = sdf.format(lastDate.getTime());
return str;
}
//
public String getNextYearFirst() {
String str = "";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate = Calendar.getInstance();
lastDate.add(Calendar.YEAR, 1);//
lastDate.set(Calendar.DAY_OF_YEAR, 1);
str = sdf.format(lastDate.getTime());
return str;
}
//
private int getMaxYear() {
Calendar cd = Calendar.getInstance();
cd.set(Calendar.DAY_OF_YEAR, 1);//
cd.roll(Calendar.DAY_OF_YEAR, -1);// 。
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);//
cd.set(Calendar.DAY_OF_YEAR, 1);//
cd.roll(Calendar.DAY_OF_YEAR, -1);// 。
int MaxYear = cd.get(Calendar.DAY_OF_YEAR);
if (yearOfNumber == 1) {
return -MaxYear;
} else {
return 1 - yearOfNumber;
}
}
//
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;
}
// *
public String getCurrentYearEnd() {
Date date = new Date();
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");//
String years = dateFormat.format(date);
return years + "-12-31";
}
// *
public String getPreviousYearFirst() {
Date date = new Date();
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");//
String years = dateFormat.format(date);
int years_value = Integer.parseInt(years);
years_value--;
return years_value + "-1-1";
}
//
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;
}
//
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");//
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;
}
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;
}
public boolean isLeapYear(int year) {
return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
}