How can I increment a date by one day in Java?

Question

I\'m working with a date in this format: yyyy-mm-dd.

How can I increment this date by one day?

Answer 1

It's very simple, trying to explain in a simple word. get the today's date as below

Calendar calendar = Calendar.getInstance();
System.out.println(calendar.getTime());// print today's date
calendar.add(Calendar.DATE, 1);

Now set one day ahead with this date by calendar.add method which takes (constant, value). Here constant could be DATE, hours, min, sec etc. and value is the value of constant. Like for one day, ahead constant is Calendar.DATE and its value are 1 because we want one day ahead value.

System.out.println(calendar.getTime());// print modified date which is tomorrow's date

Thanks

Answer 2

Just pass date in String and number of next days

 private String getNextDate(String givenDate,int noOfDays) {
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        Calendar cal = Calendar.getInstance();
        String nextDaysDate = null;
    try {
        cal.setTime(dateFormat.parse(givenDate));
        cal.add(Calendar.DATE, noOfDays);

       nextDaysDate = dateFormat.format(cal.getTime());

    } catch (ParseException ex) {
        Logger.getLogger(GR_TravelRepublic.class.getName()).log(Level.SEVERE, null, ex);
    }finally{
    dateFormat = null;
    cal = null;
    }

    return nextDaysDate;

}

Answer 3

Java 8 added a new API for working with dates and times.

With Java 8 you can use the following lines of code:

// parse date from yyyy-mm-dd pattern
LocalDate januaryFirst = LocalDate.parse("2014-01-01");

// add one day
LocalDate januarySecond = januaryFirst.plusDays(1);

Answer 4

Take a look at Joda-Time (https://www.joda.org/joda-time/).

DateTimeFormatter parser = ISODateTimeFormat.date();

DateTime date = parser.parseDateTime(dateString);

String nextDay = parser.print(date.plusDays(1));

Answer 5

If you want to add a single unit of time and you expect that other fields to be incremented as well, you can safely use add method. See example below:

SimpleDateFormat simpleDateFormat1 = new SimpleDateFormat("yyyy-MM-dd");
Calendar cal = Calendar.getInstance();
cal.set(1970,Calendar.DECEMBER,31);
System.out.println(simpleDateFormat1.format(cal.getTime()));
cal.add(Calendar.DATE, 1);
System.out.println(simpleDateFormat1.format(cal.getTime()));
cal.add(Calendar.DATE, -1);
System.out.println(simpleDateFormat1.format(cal.getTime()));

Will Print:

1970-12-31
1971-01-01
1970-12-31

Answer 6

Something like this should do the trick:

String dt = "2008-01-01";  // Start date
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Calendar c = Calendar.getInstance();
c.setTime(sdf.parse(dt));
c.add(Calendar.DATE, 1);  // number of days to add
dt = sdf.format(c.getTime());  // dt is now the new date