Java get a summary of implementation methods for a specified date

Format Date  String-->Date   or  Data-->StringSimpleDateFormat 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 for global control   last week, week, week change private int weeks = 0;private  int maxdate;//January Maximum number of days private int maxyear;//one year maximum number of days/***  @param  args*/public static  void main (String[] args)  {timetest tt = new timetest (); System.out.println ("Get 6 months after the date:" +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 date of last day: "+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-.29:" +timetest.gettwoday ("2008-12-1", "2008-9-29"));} /***  the date   parameter of the specified month (before) can be */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 ());//To the date you want to be 6 months            return  strdate; }/***  gets the number of days between two dates */public static string gettwoday (string sj1,  STRING&NBSP;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);d ay =  (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);// hour  is the day of the week, its range  1~7// 1= Sunday  7= Saturday, other analogy return new  SimpleDateFormat ("Eeee"). Format (C.gettime ());} /***  converting a short time format string to a time  yyyy-mm-dd*/public static date strtodate (string strdate)  {simpledateformat formatter = new simpledateformat ("Yyyy-MM-dd"); Parseposition pos = new parseposition (0);D Ate strtodate = formatter.parse ( Strdate, pos); return strtodate;} /***  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;//  converted 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 the string Public string getdefaultday () {string str =  ""; Simpledateformat sdf=new simpledateformat ("Yyyy-mm-dd"); Calendar lastdate = calendar.getinstance (); Lastdate.set (calendar.date,1);//set to 1  of the current month Number Lastdate.add (Calendar.month,1);//Plus one months, change to next month's 1  Lastdate.add (calendar.date,-1);//Minus one day becomes the last day of the month Str=sdf.format (Lastdate.gettime ()); Return str;}   Public string getpreviousmonthfirst () {string str =  "" On the first day of last month; Simpledateformat sdf=new simpledateformat ("Yyyy-mm-dd"); Calendar lastdate = calendar.getinstance (); Lastdate.set (calendar.date,1);//set to 1  of the current month Lastdate.add (calendar.month,-1);//Minus one months, which becomes the 1 //lastdate.add (calendar.date,-1) of next month;/Minus one day becomes 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 1  of the current month str= Sdf.format (Lastdate.gettime ()); return str;}   Get the date of Sunday this week public string getcurrentweekday ()  {weeks = 0;int mondayplus  = this.getmondayplus (); GregoriancalendAr currentdate = new gregoriancalendar (); Currentdate.add (gregoriancalendar.date,  mondayplus+6);D ate monday = currentdate.gettime ();D ateformat df =  Dateformat.getdateinstance (); String premonday = df.format (Monday); return premonday;} Get the day Time Public string getnowtime (String dateformat) {date now = new date (); Simpledateformat dateformat = new simpledateformat (DateFormat);//You can easily 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 day of the week, Sunday is the first day, Tuesday is the second day ... int dayofweek = cd.get ( Calendar.day_of_week) -1; //because of the first day of worship in China, so here 1if  (dayofweek == 1)  {return 0;}  else {return 1 - dayofweek;}} Get this Monday date Public string getmondayofweek () {WEEKS&NBsp;= 0;int mondayplus = this.getmondayplus (); Gregoriancalendar currentdate = new gregoriancalendar (); Currentdate.add ( Gregoriancalendar.date, mondayplus);D ate monday = currentdate.gettime ();D ATEFORMAT&NBSP;DF  = dateformat.getdateinstance (); String premonday = df.format (Monday); return premonday;} Date of Saturday of the corresponding week public string getsaturday ()  {int mondayplus = this.getmondayplus (); Gregoriancalendar currentdate = new gregoriancalendar (); Currentdate.add ( GREGORIANCALENDAR.DATE,&NBSP;MONDAYPLUS&NBSP;+&NBSP;7&NBSP;*&NBSP;WEEKS&NBSP;+&NBSP;6);D ate monday =  currentdate.gettime ();D ateformat df = dateformat.getdateinstance (); String premonday = df.format (Monday); return premonday;}   received last Sunday's date public string getpreviousweeksunday ()  {weeks=0;weeks--;int mondayplus  = this.getmondayplus (); Gregoriancalendar currentdate = new gregoriancalendar (); Currentdate.add ( Gregoriancalendar.date, mondayplus+weeks);D ate monday = currentdate.gettime ();D Ateformat  df = dateformat.getdateinstance (); String premonday = df.format (Monday); return premonday;}   received last Monday's date public string getpreviousweekday ()  {weeks--;int mondayPlus =  This.getmondayplus (); Gregoriancalendar currentdate = new gregoriancalendar (); Currentdate.add ( Gregoriancalendar.date, mondayplus + 7 * weeks);D ate monday =  Currentdate.gettime ();D ateformat 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);D ate monday =  Currentdate.gettime ();D ateformat 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);D ate monday = currentdate.gettime ();D Ateformat 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,&NBSP;-1);//Date rolls 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,&NBSP;1);//Set the date to the first day of the month Lastdate.roll (calendar.date, -1);//date rolled back one day, that is, the last day of this 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,&NBSP;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 a month lastdate.set ( CALENDAR.DATE,&NBSP;1);//Set the date to the first day of the month Lastdate.roll (calendar.date, -1);//date rolled back one day, that is, the last day of this 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&NBSP;INT&NBsp;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);//To obtain the day is the first day of the Year Cd.set (calendar.day_of_year,1);//Set the date to 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);D ate yearday = currentdate.gettime ();D ateformat df =  dateformat.getdateinstance (); String preyearday&nbSp;= 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");//You can easily modify the date format String years  = dateformat.format (date); return years+ "-12-31";} Get the date of the first day of the previous year  *public string getpreviousyearfirst () {date date = new date (); Simpledateformat dateformat = new simpledateformat ("yyyy");//You can easily modify the date format String years  = dateformat.format (date);  int years_value = integer.parseint (years); Years_ Value--;return years_value+ "-1-1";} Get the last day of the year date public string getpreviousyearend () {weeks--;int yearplus =  This.getyearplus (); Gregoriancalendar currentdate = new gregoriancalendar (); Currentdate.add ( gregoriancalendar.date,yearplus+maxyear*weeks+ (MaxYear-1));D Ate yearday = currenTdate.gettime ();D ateformat df = dateformat.getdateinstance (); String preyearday = df.format (Yearday); Getthisseasontime (one); 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&NBSP;START_MONTH&NBSP;=&NBSP;ARRAY[SEASON-1][0];INT&NBSP;END_MONTH&NBSP;=&NBSP;ARRAY[SEASON-1][2];D ate  date = new date (); Simpledateformat dateformat = new simpledateformat ("yyyy");//You can easily modify the date format String years  = dateformat.format (date); Int years_value = integer.parseint (years); Int start_ days =1;//years+ "-" +string.valueof (start_month) + "-";//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 *  @param  year  *  @param  month  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 a leap year*  @param  year  Year *  @return */public boolean isleapyear (int year)  {return   (year % 4 == 0 && year % 100 != 0)  | |   (year % 400 == 0);}

Java get a summary of implementation methods for a specified date