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

In Java 8 simple way to do is:

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

Answer 2

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"));

Answer 3

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();
  }
}

Answer 4

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

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

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);