Java method Summary for getting a specified date

Format Date string-->date or data-->string

SimpleDateFormat SDF = new SimpleDateFormat ("Yyyy-mm-dd");
Date date = Sdf.parse ("2009-11-04");//string-->date

String sdate = Sdf.format (date);//Data-->string ===============================================================

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 {
Used to globally control the week change of the week, week, week
private int weeks = 0;
private int maxdate;//January max days
private int maxyear;//Maximum number of days in a year
/**
* @param args
*/
public static void Main (string[] args) {
Timetest tt = new Timetest ();

System.out.println ("Date 6 months later:" +tt. Getaftermonth (6);
System.out.println ("Get Day Date:" +tt.getnowtime ("Yyyy-mm-dd"));
System.out.println ("Get this week 1st:" +tt.getmondayofweek ());
System.out.println ("Get this Sunday date ~:" +tt.getcurrentweekday ());
System.out.println ("Get last 1st period:" +tt.getpreviousweekday ());
System.out.println ("Get last week Giges period:" +tt.getpreviousweeksunday ());
System.out.println ("Get Next week 1st:" +tt.getnextmonday ());
System.out.println ("Get next week Giges period:" +tt.getnextsunday ());
System.out.println ("To obtain the corresponding week of Saturday:" +tt.getnowtime ("Yyyy-mm-dd"));
System.out.println ("Get the first day of the month Date:" +tt.getfirstdayofmonth ());
System.out.println ("Get the last day of the month Date:" +tt.getdefaultday ());
System.out.println ("Get the first day of the month Date:" +tt.getpreviousmonthfirst ());
System.out.println ("Get date of last day of last month:" +tt.getpreviousmonthend ());
System.out.println ("Get first day of next month Date:" +tt.getnextmonthfirst ());
System.out.println ("Get the last day of next month Date:" +tt.getnextmonthend ());
System.out.println ("Get the first day of the year Date:" +tt.getcurrentyearfirst ());
System.out.println ("Get the last day of the year Date:" +tt.getcurrentyearend ());
System.out.println ("Get the first day of last year date:" +tt.getpreviousyearfirst ());
System.out.println ("Get Last day of last date:" +tt.getpreviousyearend ());
System.out.println ("Get the first day of next year's date:" +tt.getnextyearfirst ());
System.out.println ("Get the last day of next year date:" +tt.getnextyearend ());
System.out.println ("Get the first day of the quarter to the last day:" +tt.getthisseasontime (11));
System.out.println ("Gets the number of days between two dates 2008-12-1~2008-
9.29: "+timetest.gettwoday (" 2008-12-1 "," 2008-9-29 "));
}

/**
* Get a negative number for the date parameter after the specified month (before)

*/

public static String getaftermonth (int month) {
Calendar C = calendar.getinstance ();//Get an instance of a calendar
SimpleDateFormat SDF = new SimpleDateFormat ("Yyyy-mm-dd");
Date date = null;
try{
Date = Sdf.parse ("2009-11-04");//Initial Date
}catch (Exception e) {

}
C.settime (date);//Set Calendar time
C.add (calendar.month,month);//Add 6 months to the calendar month
String strdate = Sdf.format (C.gettime ());//The date you want to be 6 months later
return strdate;

}

/**
* Get the number of days between two dates
*/
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 + "";
}
/**
* A string that returns the day of the week based on a date
*/
public static string Getweek (String sdate) {
Convert to TIME
Date date = Timetest.strtodate (sdate);
Calendar C = calendar.getinstance ();
C.settime (date);
int Hour=c.get (Calendar.day_of_week);
The hour is the day of the week, its range 1~7
1= Sunday 7= Saturday, other analogies
return new SimpleDateFormat ("Eeee"). Format (C.gettime ());
}
/**
* Convert short time Format strings to time YYYY-MM-DD
*/
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;
}
/**
* Number of days between two hours
*
* @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;
Convert to Standard Time
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;
}
Calculates the last day of the month, returns a string
Public String Getdefaultday () {
String str = "";
SimpleDateFormat sdf=new SimpleDateFormat ("Yyyy-mm-dd");
Calendar lastdate = Calendar.getinstance ();
Lastdate.set (calendar.date,1);//Set as number 1th of the current month
Lastdate.add (calendar.month,1);//Add one months to the next month's number 1th
Lastdate.add (calendar.date,-1);//Minus one day, becoming the last day of the month
Str=sdf.format (Lastdate.gettime ());
return str;
}
First day of last month
Public String Getpreviousmonthfirst () {
String str = "";
SimpleDateFormat sdf=new SimpleDateFormat ("Yyyy-mm-dd");
Calendar lastdate = Calendar.getinstance ();
Lastdate.set (calendar.date,1);//Set as number 1th of the current month
Lastdate.add (calendar.month,-1);//Minus one months, change to 1th in next month
Lastdate.add (calendar.date,-1);//Minus one day, becoming the last day of the month
Str=sdf.format (Lastdate.gettime ());
return str;
}
Get the first day of the month
Public String Getfirstdayofmonth () {
String str = "";
SimpleDateFormat sdf=new SimpleDateFormat ("Yyyy-mm-dd");
Calendar lastdate = Calendar.getinstance ();
Lastdate.set (calendar.date,1);//Set as number 1th of the current month
Str=sdf.format (Lastdate.gettime ());
return str;
}
Get the date of the week Sunday
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;
}
Get the time of day
public string Getnowtime (string dateformat) {
Date now = new Date ();
SimpleDateFormat DateFormat = new SimpleDateFormat (DateFormat);//Can
To facilitate
To modify the date format
String hehe = Dateformat.format (now);
return hehe;
}
Get the number of days that the current date differs from this Sunday
private int Getmondayplus () {
Calendar cd = Calendar.getinstance ();
Get today is the day of the week, Sunday is the first, Tuesday is the second day ...
int dayOfWeek = Cd.get (Calendar.day_of_week)-1; Because according to China Monday
As the first
Day, so minus 1 here.
if (DayOfWeek = = 1) {
return 0;
} else {
return 1-dayofweek;
}
}
Get the date of this Monday
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;
}
Get the Saturday date of the corresponding week
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;
}
Get the date of last Sunday
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;
}
Get the date of last Monday
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;
}
Get the date of next Monday
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;
}
Get the date of next Sunday
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);//Set the date to the first day of the month
Cd.roll (Calendar.date,-1);//Date Roll back one day, that is the last day
Maxdate=cd.get (calendar.date);
if (Monthofnumber = = 1) {
Return-maxdate;
}else{
return 1-monthofnumber;
}
}
Get the date of the last day of last month
Public String Getpreviousmonthend () {
String str = "";
SimpleDateFormat sdf=new SimpleDateFormat ("Yyyy-mm-dd");
Calendar lastdate = Calendar.getinstance ();
Lastdate.add (calendar.month,-1);//Minus one months
Lastdate.set (calendar.date, 1);//Set the date to the first day of the month
Lastdate.roll (Calendar.date,-1);//date rolled back one day, the last day of the month
Str=sdf.format (Lastdate.gettime ());
return str;
}
Get the date of the first day of next month
Public String Getnextmonthfirst () {
String str = "";
SimpleDateFormat sdf=new SimpleDateFormat ("Yyyy-mm-dd");
Calendar lastdate = Calendar.getinstance ();
Lastdate.add (calendar.month,1);//Minus one months
Lastdate.set (calendar.date, 1);//Set the date to the first day of the month
Str=sdf.format (Lastdate.gettime ());
return str;
}
Get the date of the last day of next month
Public String Getnextmonthend () {
String str = "";
SimpleDateFormat sdf=new SimpleDateFormat ("Yyyy-mm-dd");
Calendar lastdate = Calendar.getinstance ();
Lastdate.add (calendar.month,1);//Plus one months
Lastdate.set (calendar.date, 1);//Set the date to the first day of the month
Lastdate.roll (Calendar.date,-1);//date rolled back one day, the last day of the month
Str=sdf.format (Lastdate.gettime ());
return str;
}
Get the date of the last day of next year
Public String Getnextyearend () {
String str = "";
SimpleDateFormat sdf=new SimpleDateFormat ("Yyyy-mm-dd");
Calendar lastdate = Calendar.getinstance ();
Lastdate.add (calendar.year,1);//Plus one year
Lastdate.set (calendar.day_of_year, 1);
Lastdate.roll (Calendar.day_of_year,-1);
Str=sdf.format (Lastdate.gettime ());
return str;
}
Get the date of the first day of next year
Public String Getnextyearfirst () {
String str = "";
SimpleDateFormat sdf=new SimpleDateFormat ("Yyyy-mm-dd");
Calendar lastdate = Calendar.getinstance ();
Lastdate.add (calendar.year,1);//Plus one year
Lastdate.set (calendar.day_of_year, 1);
Str=sdf.format (Lastdate.gettime ());
return str;
}
Get how many days this year
private int getmaxyear () {
Calendar cd = Calendar.getinstance ();
Cd.set (calendar.day_of_year,1);//Set the date to the first day of the year
Cd.roll (calendar.day_of_year,-1);//Roll the date back one day.
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);//Get the day of the year
Cd.set (calendar.day_of_year,1);//Set the date to the first day of the year
Cd.roll (calendar.day_of_year,-1);//Roll the date back one day.
int maxyear = Cd.get (calendar.day_of_year);
if (Yearofnumber = = 1) {
Return-maxyear;
}else{
return 1-yearofnumber;
}
}
Get the date of the first day of the year
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;
}
Get the date of the last day of the year *
Public String Getcurrentyearend () {
Date date = new Date ();
SimpleDateFormat DateFormat = new SimpleDateFormat ("yyyy");
To repair
Change date format
String years = Dateformat.format (date);
Return years+ "-12-31";
}

Get the date of the first day of the year *
Public String Getpreviousyearfirst () {
Date date = new Date ();
SimpleDateFormat DateFormat = new SimpleDateFormat ("yyyy");
To repair
Change date format
String years = Dateformat.format (date); int years_value = Integer.parseint
(years);
years_value--;
Return years_value+ "-1-1";
}
Get the date of the last day of the year
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;
}
Get this quarter
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");
To repair
Change date format
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;
}
/**
* Get the last day of a month in a year
* @param year
* @param month
* @return Last Day
*/
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;
}

/**
* Whether leap year
* @param year
* @return
*/
public boolean isleapyear (int year) {
Return (year% 4 = = 0 && Year% 100! = 0) | | (Year% 400 = = 0);
}

Java method Summary for getting a specified date