CODEWITHSUNDEEP
javadate
user48094
user48094

Reputation: 10641

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

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

How can I increment this date by one day?

Upvotes: 667

Views: 1190405

Answers (30)

Arvind Kumar Avinash
Arvind Kumar Avinash

Reputation: 79580

The highest voted answer uses legacy java.util date-time API which was the correct thing to do in 2009 when the question was asked. In March 2014, java.time API supplanted the error-prone legacy date-time API. Since then, it is strongly recommended to use this modern date-time API.

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

You have used the wrong letter for the month, irrespective of whether you are using the legacy parsing/formatting API or the modern one. The letter m is used for minute-of-hour and the correct letter for month-of-year is M.

yyyy-MM-dd is the default format of java.time.LocalDate

The java.time API is based on ISO 8601 standards and therefore it does not require specifying a DateTimeFormatter explicitly to parse a date-time string if it is already in ISO 8601 format. Similarly, the toString implementation of a java.time type returns a string in ISO 8601 format. Check LocalDate#parse and LocalDate#toString for more information.

Ways to increment a local date by one day

There are three options:

  1. LocalDate#plusDays(long daysToAdd)
  2. LocalDate#plus(long amountToAdd, TemporalUnit unit): It has got some additional capabilities e.g. you can use it to increment a local date by days, weeks, months, years etc.
  3. LocalDate#plus(TemporalAmount amountToAdd): You can specify a Period (or any other type implementing the TemporalAmount) to add.

Demo:

import java.time.Instant;
import java.time.LocalDate;
import java.time.Period;
import java.time.temporal.ChronoUnit;

public class Main {
    public static void main(String[] args) {
        // Parsing
        LocalDate ldt = LocalDate.parse("2020-10-20");
        System.out.println(ldt);

        // Incrementing by one day
        LocalDate oneDayLater = ldt.plusDays(1);
        System.out.println(oneDayLater);

        // Alternatively
        oneDayLater = ldt.plus(1, ChronoUnit.DAYS);
        System.out.println(oneDayLater);

        oneDayLater = ldt.plus(Period.ofDays(1));
        System.out.println(oneDayLater);

        String desiredString = oneDayLater.toString();
        System.out.println(desiredString);
    }
}

Output:

2020-10-20
2020-10-21
2020-10-21
2020-10-21
2020-10-21

How to switch from the legacy to the modern date-time API?

You can switch from the legacy to the modern date-time API using Date#toInstant on a java-util-date instance. Once you have an Instant, you can easily obtain other date-time types of java.time API. An Instant represents a moment in time and is independent of a time-zone i.e. it represents a date-time in UTC (often displayed as Z which stands for Zulu-time and has a ZoneOffset of +00:00).

Demo:

import java.time.Instant;
import java.time.LocalDateTime;
import java.time.OffsetDateTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.util.Date;

public class Main {
    public static void main(String[] args) {
        Date date = new Date();
        Instant instant = date.toInstant();
        System.out.println(instant);

        ZonedDateTime zdt = instant.atZone(ZoneId.of("Asia/Kolkata"));
        System.out.println(zdt);

        OffsetDateTime odt = instant.atOffset(ZoneOffset.of("+05:30"));
        System.out.println(odt);
        // Alternatively, using time-zone
        odt = instant.atZone(ZoneId.of("Asia/Kolkata")).toOffsetDateTime();
        System.out.println(odt);

        LocalDateTime ldt = LocalDateTime.ofInstant(instant, ZoneId.of("Asia/Kolkata"));
        System.out.println(ldt);
        // Alternatively,
        ldt = instant.atZone(ZoneId.of("Asia/Kolkata")).toLocalDateTime();
        System.out.println(ldt);
    }
}

Output:

2022-11-12T12:52:18.016Z
2022-11-12T18:22:18.016+05:30[Asia/Kolkata]
2022-11-12T18:22:18.016+05:30
2022-11-12T18:22:18.016+05:30
2022-11-12T18:22:18.016
2022-11-12T18:22:18.016

Learn more about the modern Date-Time API from Trail: Date Time.

Upvotes: 3

krosenvold
krosenvold

Reputation: 77231

Construct a Calendar object and call add(Calendar.DATE, 1);

Upvotes: 58

samtax01
samtax01

Reputation: 952

You can do this just in one line.

e.g to add 5 days

Date newDate = Date.from(Date().toInstant().plus(5, ChronoUnit.DAYS));

to subtract 5 days

Date newDate = Date.from(Date().toInstant().minus(5, ChronoUnit.DAYS));

Upvotes: 2

Lisa
Lisa

Reputation: 4410

UPDATE (May 2021): This is a really outdated answer for old, old Java. For Java 8 and above, see https://stackoverflow.com/a/20906602/314283

Java does appear to be well behind the eight-ball compared to C#. This utility method shows the way to do in Java SE 6 using the Calendar.add method (presumably the only easy way).

public class DateUtil
{
    public static Date addDays(Date date, int days)
    {
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        cal.add(Calendar.DATE, days); //minus number would decrement the days
        return cal.getTime();
    }
}

To add one day, per the question asked, call it as follows:

String sourceDate = "2012-02-29";
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Date myDate = format.parse(sourceDate);
myDate = DateUtil.addDays(myDate, 1);

Upvotes: 258

Daniele Rugginenti
Daniele Rugginenti

Reputation: 734

I think the fastest one, that never will be deprecated, it's the one that go to the core

let d=new Date();
d.setTime(d.getTime()+86400000);
console.log(d);

It's just one line, and just 2 commands. It works on Date type, without using calendar.

I always think it's better to work with unix times on code side, and present the date just when it's ready to be shown to the user.

To print a date d, I use

let format1 = new Intl.DateTimeFormat('en', { year: 'numeric', month: 'numeric', month: '2-digit', day: '2-digit'});
let [{ value: month },,{ value: day },,{ value: year }] = format1.formatToParts(d);

It sets vars month year and day but can be extended to hours minutes and seconds and can be used also in standard rapresentations depending on country flag.

Upvotes: 0

Z4n3tti
Z4n3tti

Reputation: 115

Try this method:

public static Date addDay(int day) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(new Date());
        calendar.add(Calendar.DATE, day);
        return calendar.getTime();
}

Upvotes: 6

eHayik
eHayik

Reputation: 3262

With Java SE 8 or higher you should use the new Date/Time API

 int days = 7;       
 LocalDate dateRedeemed = LocalDate.now();
 DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/YYYY");

 String newDate = dateRedeemed.plusDays(days).format(formatter);   
 System.out.println(newDate);

If you need to convert from java.util.Date to java.time.LocalDate, you may use this method.

  public LocalDate asLocalDate(Date date) {
      Instant instant = date.toInstant();
      ZonedDateTime zdt = instant.atZone(ZoneId.systemDefault());
      return zdt.toLocalDate();
  }

With a version prior to Java SE 8 you may use Joda-Time

Joda-Time provides a quality replacement for the Java date and time classes and is the de facto standard date and time library for Java prior to Java SE 8

   int days = 7;       
   DateTime dateRedeemed = DateTime.now();
   DateTimeFormatter formatter = DateTimeFormat.forPattern("dd/MM/uuuu");
        
   String newDate = dateRedeemed.plusDays(days).toString(formatter);   
   System.out.println(newDate);

Upvotes: 10

Mike T
Mike T

Reputation: 95

It's simple actually. One day contains 86400000 milliSeconds. So first you get the current time in millis from The System by usingSystem.currentTimeMillis() then add the 84000000 milliSeconds and use the Date Class to generate A date format for the milliseconds.

Example

String Today = new Date(System.currentTimeMillis()).toString();

String Today will be 2019-05-9

String Tommorow = new Date(System.currentTimeMillis() + 86400000).toString();

String Tommorow will be 2019-05-10

String DayAfterTommorow = new Date(System.currentTimeMillis() + (2 * 86400000)).toString();

String DayAfterTommorow will be 2019-05-11

Upvotes: 5

Abdurahman Popal
Abdurahman Popal

Reputation: 3019

startCalendar.add(Calendar.DATE, 1); //Add 1 Day to the current Calender

Upvotes: 13

DaWilli
DaWilli

Reputation: 4898

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));

Upvotes: 45

Chad Juliano
Chad Juliano

Reputation: 1225

Let's clarify the use case: You want to do calendar arithmetic and start/end with a java.util.Date.

Some approaches:

  1. Convert to string and back with SimpleDateFormat: This is an inefficient solution.
  2. Convert to LocalDate: You would lose any time-of-day information.
  3. Convert to LocalDateTime: This involves more steps and you need to worry about timezone.
  4. Convert to epoch with Date.getTime(): This is efficient but you are calculating with milliseconds.

Consider using java.time.Instant:

Date _now = new Date();
Instant _instant = _now.toInstant().minus(5, ChronoUnit.DAYS);
Date _newDate = Date.from(_instant);

Upvotes: 2

dpk
dpk

Reputation: 641

In Java 8 simple way to do is:

Date.from(Instant.now().plusSeconds(SECONDS_PER_DAY))

Upvotes: 17

Kushwaha
Kushwaha

Reputation: 918

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

Upvotes: 14

Shaheed
Shaheed

Reputation: 92

You can use this package from "org.apache.commons.lang3.time":

 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
 Date myNewDate = DateUtils.addDays(myDate, 4);
 Date yesterday = DateUtils.addDays(myDate, -1);
 String formatedDate = sdf.format(myNewDate);

Upvotes: 4

Avijit Karmakar
Avijit Karmakar

Reputation: 9408

If you are using Java 8, then do it like this.

LocalDate sourceDate = LocalDate.of(2017, Month.MAY, 27);  // Source Date
LocalDate destDate = sourceDate.plusDays(1); // Adding a day to source date.

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd"); // Setting date format

String destDate = destDate.format(formatter));  // End date

If you want to use SimpleDateFormat, then do it like this.

String sourceDate = "2017-05-27";  // Start date

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

Calendar calendar = Calendar.getInstance();
calendar.setTime(sdf.parse(sourceDate)); // parsed date and setting to calendar

calendar.add(Calendar.DATE, 1);  // number of days to add
String destDate = sdf.format(calendar.getTime());  // End date

Upvotes: 24

Akhilesh T.
Akhilesh T.

Reputation: 261

Date today = new Date();               
SimpleDateFormat formattedDate = new SimpleDateFormat("yyyyMMdd");            
Calendar c = Calendar.getInstance();        
c.add(Calendar.DATE, 1);  // number of days to add      
String tomorrow = (String)(formattedDate.format(c.getTime()));
System.out.println("Tomorrows date is " + tomorrow);

This will give tomorrow's date. c.add(...) parameters could be changed from 1 to another number for appropriate increment.

Upvotes: 26

Jens
Jens

Reputation: 1659

Since Java 1.5 TimeUnit.DAYS.toMillis(1) looks more clean to me.

SimpleDateFormat dateFormat = new SimpleDateFormat( "yyyy-MM-dd" );
Date day = dateFormat.parse(string);
// add the day
Date dayAfter = new Date(day.getTime() + TimeUnit.DAYS.toMillis(1));

Upvotes: 23

micha
micha

Reputation: 49612

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);

Upvotes: 48

realhu
realhu

Reputation: 985

If you are using Java 8, java.time.LocalDate and java.time.format.DateTimeFormatter can make this work quite simple.

public String nextDate(String date){
      LocalDate parsedDate = LocalDate.parse(date);
      LocalDate addedDate = parsedDate.plusDays(1);
      DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-mm-dd");
      return addedDate.format(formatter); 
}

Upvotes: 3

Ramesh-X
Ramesh-X

Reputation: 5085

In java 8 you can use java.time.LocalDate

LocalDate parsedDate = LocalDate.parse("2015-10-30"); //Parse date from String
LocalDate addedDate = parsedDate.plusDays(1);   //Add one to the day field

You can convert in into java.util.Date object as follows.

Date date = Date.from(addedDate.atStartOfDay(ZoneId.systemDefault()).toInstant());

You can formate LocalDate into a String as follows.

String str = addedDate.format(DateTimeFormatter.ofPattern("yyyy-MM-dd"));

Upvotes: 11

Daniel C. Sobral
Daniel C. Sobral

Reputation: 297285

java.time

On Java 8 and later, the java.time package makes this pretty much automatic. (Tutorial)

Assuming String input and output:

import java.time.LocalDate;

public class DateIncrementer {
  static public String addOneDay(String date) {
    return LocalDate.parse(date).plusDays(1).toString();
  }
}

Upvotes: 105

Pawan Pareek
Pawan Pareek

Reputation: 489

you can use Simple java.util lib

Calendar cal = Calendar.getInstance(); 
cal.setTime(yourDate); 
cal.add(Calendar.DATE, 1);
yourDate = cal.getTime();

Upvotes: 37

terrmith
terrmith

Reputation: 113

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

Upvotes: 7

dvaey
dvaey

Reputation: 310

long timeadj = 24*60*60*1000;
Date newDate = new Date (oldDate.getTime ()+timeadj);

This takes the number of milliseconds since epoch from oldDate and adds 1 day worth of milliseconds then uses the Date() public constructor to create a date using the new value. This method allows you to add 1 day, or any number of hours/minutes, not only whole days.

Upvotes: 18

LMK
LMK

Reputation: 2962

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;

}

Upvotes: 7

Risav Karna
Risav Karna

Reputation: 936

I prefer to use DateUtils from Apache. Check this http://commons.apache.org/proper/commons-lang/javadocs/api-2.6/org/apache/commons/lang/time/DateUtils.html. It is handy especially when you have to use it multiple places in your project and would not want to write your one liner method for this.

The API says:

addDays(Date date, int amount) : Adds a number of days to a date returning a new object.

Note that it returns a new Date object and does not make changes to the previous one itself.

Upvotes: 72

ROCKY
ROCKY

Reputation: 1933

Apache Commons already has this DateUtils.addDays(Date date, int amount) http://commons.apache.org/proper/commons-lang/apidocs/org/apache/commons/lang3/time/DateUtils.html#addDays%28java.util.Date,%20int%29 which you use or you could go with the JodaTime to make it more cleaner.

Upvotes: 7

Filip Trajcevski
Filip Trajcevski

Reputation: 71

Date newDate = new Date();
newDate.setDate(newDate.getDate()+1);
System.out.println(newDate);

Upvotes: 0

Florian R.
Florian R.

Reputation: 441

Please note that this line adds 24 hours:

d1.getTime() + 1 * 24 * 60 * 60 * 1000

but this line adds one day

cal.add( Calendar.DATE, 1 );

On days with a daylight savings time change (25 or 23 hours) you will get different results!

Upvotes: 44

Alex B
Alex B

Reputation: 24946

SimpleDateFormat dateFormat = new SimpleDateFormat( "yyyy-MM-dd" );
Calendar cal = Calendar.getInstance();
cal.setTime( dateFormat.parse( inputString ) );
cal.add( Calendar.DATE, 1 );

Upvotes: 71

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