Increment existing date by 1 day

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

I have an existing date object that I'd like to increment by one day while keeping every other field the same. Every example I've come across sheds hours/minutes/seconds or you have to create a new date object and transfers the fields over. Is there a way you can just advance the day field by 1?

Thanks

EDIT: Sorry i didn't mean increment the value of the day by one, i meant advance the day forward by 1

No. The only way is to add 1 day to the date. The reason: suppose you increment the date field of May 31 by 1. Would that make it May 32? Whereas if you add 1 day, Java takes care of that. — Soumya, Feb 26 '11 at 20:57
Something like `date.setTime(date.getTime() + 24*60*60*1000)` is a simple dirty solution. — maaartinus, Feb 26 '11 at 22:32

MeBigFatGuy · Accepted Answer · 2011-02-26T21:36:26.710

28

Calendar c = Calendar.getInstance();
c.setTime(yourdate);
c.add(Calendar.DATE, 1);
Date newDate = c.getTime();

edited Feb 26 '11 at 21:36

answered Feb 26 '11 at 21:23

MeBigFatGuy

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2

Really nice solution. But is it also works with 31th date of the January month ?? then what happend ? – Shreyash Mahajan May 10 '12 at 07:29
5

Really? It takes 4 lines of code to increment Date?! That's just silly. – sam yi May 24 '12 at 18:05

score 6 · Answer 2 · answered Feb 26 '11 at 23:00

The Date object itself (assuming you mean java.util.Date) has no Day field, only a "milliseconds since Unix Epoch" value. (The toString() method prints this depending on the current locale.)

Depending of what you want to do, there are in principle two ways:

If you want simply "precisely 24 hours after the given date", you could simply add 1000 * 60 * 60 * 24 milliseconds to the time value, and then set this. If there is a daylight saving time shift between, it could then be that your old date was on 11:07 and the new is on 10:07 or 12:07 (depending of the direction of shift), but it still is exactly 24 hours difference.
```
private final static long MILLISECONDS_PER_DAY = 1000L * 60 * 60 * 24;

/**
 * shift the given Date by exactly 24 hours.
 */
public static void shiftDate(Date d) {
    long time = d.getTime();
    time += MILLISECONDS_PER_DAY;
    d.setTime(time);
}
```
If you want to have "the same time on the next calendar day", you better use a Calendar, like MeBigFatGuy showed. (Maybe you want to give this getInstance() method the TimeZone, too, if you don't want your local time zone to be used.)
```
/**
 * Shifts the given Date to the same time at the next day.
 * This uses the current time zone.
 */
public static void shiftDate(Date d) {
    Calendar c = Calendar.getInstance();
    c.setTime(d);
    c.add(Calendar.DATE, 1);
    d.setTime(c.getTimeInMillis());
}
```
If you are doing multiple such date manipulations, better use directly a Calendar object instead of converting from and to Date again and again.

score 5 · Answer 3 · answered Feb 26 '11 at 23:08

5

org.apache.commons.lang.time.DateUtils.addDays(date, 1);

answered Feb 26 '11 at 23:08

Tomasz Nurkiewicz

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Increment existing date by 1 day

3 Answers3

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