how to add number of days to the date given in a jtextfield with string data type

Good Day . I just wanna ask about adding days in a given date. I have a jtexfield (txtStart) and another jtexfield(txtExpiry). I need to display in txtExpiry the date after 102 days from the date in txtStart. I am using KEYRELEASED event. after i input in txtStart, the date with additional 102 days shall appear in txtExpiry.

here's my code but it's still erroneous.

private void txtStartKeyReleased(java.awt.event.KeyEvent evt) {
// TODO add your handling code here:
    // set calendar to 1 Jan 2007
    int a = Integer.parseInt(txtStart.getText());     
    Calendar calendar = new GregorianCalendar(a,a,a);

     calendar.add(Calendar.DAY_OF_MONTH,102);
     PrintCalendar(calendar);
  }

   private void PrintCalendar(Calendar calendar){
        // define output format and print
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd");         
        String date = sdf.format(calendar.getTime());
        long add = Date.parse(date);
        txtExpiry.setText(add);  -----> this part here also has an error.
     }

my code still won't generate the date in txtExpiry. Thanks in advance

Here's the right code after receiving help:

 private void txtStartKeyReleased(java.awt.event.KeyEvent evt) {
       try {    

        Date date1;
        date1 = new SimpleDateFormat("yyyy-MM-dd").parse(txtStart.getText());
        System.out.println(date1);

        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");     
        Calendar cal  = Calendar.getInstance();
                      cal.setTime(date1);
                        cal.add(Calendar.DATE, 102);
                        String expDateString = sdf.format(cal.getTime());
                        txtExpiry.setText(expDateString);
     }catch (ParseException ex) {
      Logger.getLogger(ClientInfo.class.getName()).log(Level.SEVERE, null, ex);
     } 
}

Upvotes: 3

Answers (3)

Deep Mukherjee

Reputation: 1

import java.util.*;
class ISCprac2009q01{
public static void main(String args[])
throws InputMismatchException{

Scanner scan=new Scanner(System.in);
System.out.println("ENTER DAY NUMER(>=1 AND
 <=366) : ");
int day_number=scan.nextInt();
System.out.println("ENTER YEAR(4 DIGIT) : ");
int year=scan.nextInt();
System.out.println("ENTER DATE AFTER(N)(>=1 AND
 <=100) : ");
int n=scan.nextInt();

if(day_number<1 || day_number>366)
System.out.println("INVALID DAY NUMBER.");
else if(year<1000 || year >9999)
System.out.println("INVALID YEAR");
else if(n<1 || n>100)
System.out.println("INVALID DATE AFTER VALUE.");
else{
//INITIALIZE MONTH NAMES AND NUMBER OF DAYS IN EACH MONTH
    String month_names[]={"JANUARY", "FEBRUARY","MARCH",
        "APRIL","MAY","JUNE","JULY","AUGUST","SEPTEMBER",
        "OCTOBER","NOVERMBER","DECEMBER"};
    int month_days[]={31,28,31,30,31,30,31,31,30,31,30,31};
    int i, day, month,day_after;
    String suffix;

   //IF IT IS A LEAP YEAR FEBRURAY SHOULD HAVE 29 DAYS
    if(year%400==0 || (year%100!=0 && year%4==0))
        month_days[1]=29;

        i=0;
   //FIND THE DATE CORRESPONDING TO THE DAY NUMBER
        day=day_number;
        while(day>month_days[i])
        {
            day-=month_days[i];
            i++;
        }
        month=i;
        //ADD SUFFIX AS PER THE DAY
        if(day%10==1 && day/10!=1)
            suffix="ST";
        else if(day%10==2 && day/10!=1)
            suffix="ND";
        else if(day%10==3 && day/10!=1)
            suffix="RD";
        else
            suffix="TH";
        System.out.println("OUTPUT:");
        //FIRST PART OF THE OUTPUT
        System.out.println(day+suffix+" "+
        month_names[month]+" "+year);

        //TO CALCULATE DATE AFTER N DAYS
        day_after=day_number+n;
        i=0;
        while(day_after>month_days[i])
        {
            day_after-=month_days[i];
            i++;
            if(i==12){
            i=0;
            year++;
            if(year%400==0 || (year%100!=0 && year%4==0))
                month_days[1]=29;
            }
        }
        day=day_after;
        month=i;
        //ADD SUFFIX AS PER THE DAY
        if(day%10==1 && day/10!=1)
            suffix="ST";
        else if(day%10==2 && day/10!=1)
            suffix="ND";
        else if(day%10==3 && day/10!=1)
            suffix="RD";
        else
            suffix="TH";
       //SECOND PART OF THE OUTPUT
        System.out.println(day+suffix+" "+
        month_names[month]+" "+year);
}
}
}

Upvotes: -1

Jigar Joshi

Reputation: 240900

Use

yyyy-MM-dd

Note: Capital MM

See : SimpleDateFormat

Now, once you have the date instance you could use Calendar to do the days arithmetic

Calendar cal = Calendar.getInstance();
cal.setTime(parsedDate);
cal.add(Calendar.DATE, 102);
String expDateString = dateFormatter.format(cal.getTime());

Upvotes: 7

MadProgrammer

Reputation: 347204

Once you have the correct format, you could use JodaTime. You could parse the String value directly using JodaTime, but since you've already done that, I've not bothered...

Date date = ...;
DateTime dt = new DateTime(date);
dt = dt.plusDays(102);
date = dt.toDate();

Upvotes: 0

how to add number of days to the date given in a jtextfield with string data type

Answers (3)

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