Various date acquisition

Get a date of n days

public static Date getTime (int day) {
    Calendar objcalendar=calendar.getinstance ();
    Objcalendar.add (calendar.date,day);
    Date objdate=objcalendar.gettime ();
    System.out.print (objdate);
    return objdate;
}

/**
* Get the time n days ago
* @param Day
* @return
*/

public static Date getbeforedays (int day) {
    Calendar cal=calendar.getinstance ();
    int inputdayofyear = Cal.get (calendar.day_of_year);
    Cal.set (Calendar.day_of_year, inputdayofyear-day);
    Date d =cal.gettime ();
    return D;
}

/**

* Convert date format string to date type

* Dates @param date String type

*/

public static date Dateformat2 (String date) throws ParseException {
    SimpleDateFormat f = new SimpleDateFormat ("Yyyy-m M-dd HH:mm:ss ");
    Date Mydate=f.parse (date);
    return mydate;
}

/ **

* The string date of the specified type method is converted to date

*/

public static date format (string Date, String pattern) {
    if (pattern = = NULL | | pattern.equals ("") | | Pattern.equals ("null")) {Pattern
        = "Yyyy-mm-dd HH:mm:ss";
    }
    If date = null | | date.equals ("") | | Date.equals ("null")) {return
        new Date ();
    }
    Date d = null;
    try {
        d = new Java.text.SimpleDateFormat (pattern). Parse (date);
    \ catch (parseexception pe) {
    }
    return D;
}

/**

* Get the date parameter after the specified month (before) to send negative numbers
* @param the time month want
* @param datestr date format must be YYYY-MM-DD HH:MM:SS
* @return Yyyy-mm-dd HH:mm:ss time
*/

public static String  getaftermonth (int month,string datestr) {
        Calendar c = calendar.getinstance ();//Get an instance of a calendar   
        SimpleDateFormat sdf = new SimpleDateFormat ("Yyyy-mm-dd HH:mm:ss");   
        Date date = null;   
        try{Date   
            = Sdf.parse (DATESTR);//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 6 months back.   
        strdate;
 }

/**

* Get the current time H hours after
* @param m
* @return
*/
@SuppressWarnings ("Static-access")

public static string getcalendartime (int h) {
    String str = "";
    Calendar cl = calendar.getinstance ();
    Cl.add (CL. Hour_of_day, h);
    str = Cl.get (CL. Year) + "years" + (Cl.get (CL. MONTH + 1) + "month"
          + (Cl.get) (CL. Day_of_month) + "Day" + (Cl.get) (CL. Hour_of_day)
          + "Time" + (Cl.get) (CL. MINUTE) + "min" + (Cl.get) (CL. SECOND)) + "seconds";
    return str;
}

/**
* YYYY year MM month DD Day week
* @return
*/
@SuppressWarnings ("deprecation")

public static String GetDate () {
    StringBuffer sb = new StringBuffer ();
    Date d = new Date ();
    int hours = D.gethours ();
    int minute = D.getminutes ();
    String[] weekdays = {"Day", "one", "two", "three", "four", "five", "Six"};
    Sb.append ((D.getyear () + 1900));
    Sb.append ("year");
    Sb.append (D.getmonth () + 1);
    Sb.append ("month");
    Sb.append (D.getdate ());
    Sb.append ("Day Week");
    Sb.append (Weekdays[d.getday ());
    return sb.tostring ();
}

/**

* Returns the number of days difference between two dates
* @param d1 A long time
* @param D2 a short time
* @return int
*/

public static int Dispersionday (string strDate1, String strDate2) {int iday = 0;//record number of days to try {int in
        Dex1,index2;
        Index1=strdate1.indexof ('-');
        Index2=strdate1.lastindexof ('-');
        int nyear, nmonth, Nday;
        Nyear = Integer.parseint (strdate1.substring (0, index1));
        Nmonth = Integer.parseint (strdate1.substring (index1+1, index2));
        Nday = Integer.parseint (strdate1.substring (index2+1)); Calendar objCalendarDate1 = Calendar.getinstance ();//This function is new GregorianCalendar () Objcalendardate1.set (Nyear, n
               
        Month, Nday);
        Index1=strdate2.indexof ('-');
      
        Index2=strdate2.lastindexof ('-');
        Nyear = Integer.parseint (strdate2.substring (0, index1));
        Nmonth = Integer.parseint (strdate2.substring (index1+1, index2));
        Nday = Integer.parseint (strdate2.substring (index2+1));
        Calendar ObjCalendarDate2 = Calendar.getinstance (); Objcalendardate2.set (Nyear, Nmonth, Nday);
        if (Objcalendardate2.equals (objCalendarDate1)) return 0; if (Objcalendardate2.after (objCalendarDate1)) {//if strdate2>strdate1 while!objcalendardate2.equals (OBJC
                alendarDate1)) {Objcalendardate1.add (objcalendardate1.date, 1);
            iday++; 
        The Iday =-iday;//minus sign represents a few days apart, plus the positive symbol has been in the past few days ... else{//if Strdate1>strdate2 while (!objcalendardate2.equals (objCalendarDate1)) {objcal
                Endardate2.add (objcalendardate2.date, 1);
            iday++;
The catch (Exception e) {} return iday; }

Determine whether the time is within a certain period

public static Boolean Istimein (Date time,date begin,date end) {return
       time.gettime () >=begin.gettime () & & Time.gettime () <=end.gettime ();
}

Get the date of this Monday

public static Date Getmondayofweek () {
    int mondayplus = Getmondayplus ();
    GregorianCalendar currentdate = new GregorianCalendar ();
    Currentdate.add (Gregoriancalendar.date, mondayplus);
    Date Monday = Currentdate.gettime ();
return Monday;

}

Get the date of this week Sunday

<pre name= "code" class= "java" >public static  Date getcurrentweekday () {
    int mondayplus = Getmondayplus ();
    GregorianCalendar currentdate = new GregorianCalendar ();
    Currentdate.add (Gregoriancalendar.date, mondayplus+6);
    Date Monday = Currentdate.gettime ();
    return Monday;
}

Get the date of last Monday

public static  Date Getpreviousweekday () {
    int mondayplus =getmondayplus ();
    GregorianCalendar currentdate = new GregorianCalendar ();
    Currentdate.add (gregoriancalendar.date, Mondayplus + 7 *-1);
    Date Monday = Currentdate.gettime ();
    DateFormat df = dateformat.getdateinstance ();
    String Premonday = Df.format (Monday);
    return Monday;
}

Get the date of last Sunday

public static  Date Getpreviousweeksunday () {
//weeks--;
int mondayplus = Getmondayplus ();
GregorianCalendar currentdate = new GregorianCalendar ();
Currentdate.add (Gregoriancalendar.date, mondayPlus-1);
Date Monday = Currentdate.gettime ();
DateFormat df = dateformat.getdateinstance ();
String Premonday = Df.format (Monday);
return Monday;
}

Get the first day of the month

public static string Getfirstdayofmonth () {
string str = "";
SimpleDateFormat sdf=new SimpleDateFormat ("Yyyy-mm-dd");
Calendar lastdate = Calendar.getinstance ();
Lastdate.set (calendar.date,1);//set to the current month, number 1th
Str=sdf.format (Lastdate.gettime ());
return str;
}

Calculates the last day of the month, returns a string

public static string Getdefaultday () {
string str = "";
SimpleDateFormat sdf=new SimpleDateFormat ("Yyyy-mm-dd");
Calendar lastdate = Calendar.getinstance ();
Lastdate.set (calendar.date,1)//set to the current month, number 1th
Lastdate.add (calendar.month,1),//plus one months, into the next month 1th
Lastdate.add ( CALENDAR.DATE,-1);/Minus one day, into the last day of the month
Str=sdf.format (Lastdate.gettime ());
return str;
}

Get Day time

public static string Getnowtime (string dateformat) {The
    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

public static int Getmondayplus () {
    Calendar cd = Calendar.getinstance ();
    Get today is the day of the week, Sunday is the first, Tuesday is the next day
    ... int dayofweek = Cd.get (Calendar.day_of_week)-1;         Because press China Monday as the first day so here minus 1
    if (DayOfWeek = = 1) {return
        0;
    } else {return
        1-dayofweek;}
}