How to add days into the date in android

Question

In my database I am getting start date like 2011-11-30(yyyy/mm/dd)format.and duration date like 40 days.How can i calculate the days and get new date format of mm/dd/yyyy.

Can anyone help me

Thanks

possible duplicate of [How to add days to a date in Java](http://stackoverflow.com/questions/2507377/how-to-add-days-to-a-date-in-java) — Ranhiru Jude Cooray, Jan 05 '12 at 06:12

score 97 · Answer 1 · edited Jun 19 '16 at 17:27

97

You can try something like this,

String dt = "2012-01-04";  // Start date
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Calendar c = Calendar.getInstance();
try {
    c.setTime(sdf.parse(dt));
} catch (ParseException e) {
    e.printStackTrace();
}
c.add(Calendar.DATE, 40);  // number of days to add, can also use Calendar.DAY_OF_MONTH in place of Calendar.DATE
SimpleDateFormat sdf1 = new SimpleDateFormat("MM-dd-yyyy");
String output = sdf1.format(c.getTime());

edited Jun 19 '16 at 17:27

Mike

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answered Jan 05 '12 at 06:13

Lalit Poptani

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A side note, Calendar.DATE is synonymous with Calendar.DAY_OF_MONTH, which might be more readable – Tyler Jan 05 '12 at 06:14
@Styler added in the comment. Thanks. – Lalit Poptani Jan 05 '12 at 06:31
While this was a fine answer in 2012, I recommend we no longeruse `SimpleDateFormat` and `Calendar`. Those classes are poorly designed and long outdated, the former in particular notoriously troublesome. Instead use `LocalDate` and `DateTimeFormatter`, both from [java.time, the modern Java date and time API](https://docs.oracle.com/javase/tutorial/datetime/). – Ole V.V. Sep 02 '20 at 04:07

score 28 · Answer 2 · answered Jan 05 '12 at 06:32

Step-1 Get Calendar instance from the specified string

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            Calendar c = Calendar.getInstance();
            c.setTime(sdf.parse(dateInString));

Step-2 use add() to add number of days to calendar

c.add(Calendar.DATE, 40);

Step-3 Convert the dtae to the resultant date format

sdf = new SimpleDateFormat("MM/dd/yyyy");
            Date resultdate = new Date(c.getTimeInMillis());
            dateInString = sdf.format(resultdate);

Source Code

String dateInString = "2011-11-30";  // Start date
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Calendar c = Calendar.getInstance();
        c.setTime(sdf.parse(dateInString));
        c.add(Calendar.DATE, 40);  
        sdf = new SimpleDateFormat("MM/dd/yyyy");
        Date resultdate = new Date(c.getTimeInMillis());
        dateInString = sdf.format(resultdate);
        System.out.println("String date:"+dateInString);

score 8 · Answer 3 · answered Dec 02 '13 at 08:00

8

Date dtStartDate=o.getStartDate();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm");
Calendar c = Calendar.getInstance();
c.setTime(dtStartDate);
c.add(Calendar.DATE, 3);  // number of days to add
String dt = sdf.format(c.getTime());  // dt is now the new date
Toast.makeText(this, "" + dt, 5000).show();

answered Dec 02 '13 at 08:00

Roadies

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This is example adds 3 days. If you want 3 days ago, change the parameter to -3. – Al Lelopath Oct 06 '16 at 16:26

score 8 · Answer 4 · answered Jan 13 '17 at 11:50

This code is working 100%

            Calendar c = Calendar.getInstance();
            SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");// HH:mm:ss");
            String reg_date = df.format(c.getTime());
            showtoast("Currrent Date Time : "+reg_date);

            c.add(Calendar.DATE, 3);  // number of days to add
            String end_date = df.format(c.getTime());
            showtoast("end Time : "+end_date);

Aashis Shrestha · Answer 5 · 2019-04-08T07:01:32.227

This piece of code should do the job well!!!

public static String addDay(String oldDate, int numberOfDays) {
    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
    Calendar c = Calendar.getInstance();
    try {
        c.setTime(dateFormat.parse(oldDate));
    } catch (ParseException e) {
        e.printStackTrace();
    }
    c.add(Calendar.DAY_OF_YEAR,numberOfDays);
    dateFormat=new SimpleDateFormat("MM-dd-YYYY");
    Date newDate=new Date(c.getTimeInMillis());
    String resultDate=dateFormat.format(newDate);
    return resultDate;
}

For more functionality do please checkout this link
Add days,months,years to a date

`oldDate` in `c.setTime(dateFormat.parse(oldDate));` is a Date, the function is expecting a Date. — Marc LaQuay, Feb 20 '19 at 11:05

score 3 · Answer 6 · answered Sep 02 '20 at 04:13

java.time

The modern answer to this question is long overdue. Do consider using java.time, the modern Java date and time API, for your date work.

    DateTimeFormatter outputFormatter = DateTimeFormatter.ofPattern("MM/dd/uuuu");
    int durationDays = 40;
    
    LocalDate startDate = LocalDate.parse("2011-11-30");
    LocalDate newDate = startDate.plusDays(durationDays);
    
    String formattedDate = newDate.format(outputFormatter);
    System.out.format(formattedDate);

Output is:

01/09/2012

Question: Doesn’t java.time require Android API level 26?

java.time works nicely on both older and newer Android devices. It just requires at least Java 6.

In Java 8 and later and on newer Android devices (from API level 26) the modern API comes built-in.
In non-Android Java 6 and 7 get the ThreeTen Backport, the backport of the modern classes (ThreeTen for JSR 310; see the links at the bottom).
On older Android either use desugaring or the Android edition of ThreeTen Backport. It’s called ThreeTenABP. In the latter case make sure you import the date and time classes from org.threeten.bp with subpackages.

Links

Oracle tutorial: Date Time explaining how to use java.time.
Java Specification Request (JSR) 310, where java.time was first described.
ThreeTen Backport project, the backport of java.time to Java 6 and 7 (ThreeTen for JSR-310).
Java 8+ APIs available through desugaring
ThreeTenABP, Android edition of ThreeTen Backport
Question: How to use ThreeTenABP in Android Project, with a very thorough explanation.

score 1 · Answer 7 · answered Oct 21 '12 at 04:33

Calendar c = Calendar.getInstance();
    int mYear = c.get(Calendar.YEAR);
    int mMonth = c.get(Calendar.MONTH);
    int mDay = c.get(Calendar.DAY_OF_MONTH);

    // display the current date
    String CurrentDate = mYear + "/" + mMonth + "/" + mDay;

    String dateInString = CurrentDate; // Start date
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

    c = Calendar.getInstance();

    try {
        c.setTime(sdf.parse(dateInString));
    } catch (ParseException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    c.add(Calendar.DATE, 7656);//insert the number of days you want to be added to the current date
    sdf = new SimpleDateFormat("dd/MM/yyyy");
    Date resultdate = new Date(c.getTimeInMillis());
    dateInString = sdf.format(resultdate);

    //Display the Result in the Edit Text or Text View your Choice
    EditText etDOR = (EditText)findViewById(R.id.etDateOfReturn);
    etDOR.setText(dateInString);

score 0 · Answer 8 · edited Dec 02 '17 at 03:28

It works for me.

Calendar c = Calendar.getInstance();
int mYear = c.get(Calendar.YEAR);
int mMonth = c.get(Calendar.MONTH);
int mDay = c.get(Calendar.DAY_OF_MONTH);

String CurrentDate = mYear + "/" + mMonth + "/" + mDay;
String dateInString = dob; // Select date
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
c = Calendar.getInstance();
try {
c.setTime(sdf.parse(dateInString));
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
c.add(Calendar.DATE, 14);    //14 dats add
sdf = new SimpleDateFormat("dd/MM/yyyy");
Date resultdate = new Date(c.getTimeInMillis());
dateInString = sdf.format(resultdate);
System.out.println(dateInString);

score 0 · Answer 9 · answered Jul 21 '20 at 05:31

0

Don't use:

Calendar c = Calendar.getInstance();

Use this instead:

GregorianCalendar calendar =new GregorianCalendar();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.add(Calendar.DAY_OF_MONTH , 30);

answered Jul 21 '20 at 05:31

MasterOne Piece

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5
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What is reason for "Don't use", did you come across a bug or something?! – Farid Sep 10 '20 at 06:27

score -1 · Answer 10 · edited Mar 19 '17 at 22:34

Just Simple copy this method pass data

public static String ConvertToDate(String dateString,String inputFormater ,String outputFormater) {
        String outputText = "" ;
        try {
            SimpleDateFormat inputFormat = new SimpleDateFormat(inputFormater);
            SimpleDateFormat outputFormat = new SimpleDateFormat(outputFormater);
            Date parsed = null;
            parsed = inputFormat.parse(dateString);
            outputText = outputFormat.format(parsed);

        Log.d(TAG, "  msg : " + outputText);
        } catch (ParseException e) {
            e.printStackTrace();
            Log.e(TAG, "ERROR : " + e.getMessage());
        }
        return outputText;
    }

And call it like

 public static String INPUTE_JSON_DATE_FORMAT = "yyyy-MM-dd HH:mm:ss";
 public static String FORMAT_FOR_JOB_APPLIED = "MMM dd, yyyy";
 String date ="2017-10-29";
 ConvertToDate(date ,DateUtils.INPUTE_JSON_DATE_FORMAT ,DateUtils.FORMAT_FOR_JOB_APPLIED);

You can put any format you want in your cituation

ConvertToDate("2011-11-30","yyyy/mm/dd" ,"mm/dd/yyyy");

The question is how to add days to a date. – Gumby The Green Nov 14 '19 at 01:53 — Gumby The Green, Nov 14 '19 at 01:53

How to add days into the date in android

10 Answers10

java.time

Question: Doesn’t java.time require Android API level 26?

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