How to Format Localdate to String

How to format LocalDate to string?

SimpleDateFormat will not work if he is starting with LocalDate which is new in Java 8. From what I can see, you will have to use DateTimeFormatter, http://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html.

LocalDate localDate = LocalDate.now();//For reference
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd LLLL yyyy");
String formattedString = localDate.format(formatter);

That should print 05 May 1988. To get the period after the day and before the month, you might have to use "dd'.LLLL yyyy"

how do I convert LocalDate to String form so it prints out the date inputed

Try this.

public void displayDVD(DVD dvd) {
    if (dvd != null) {
        io.print(dvd.getTitle());
        io.print(dvd.getReleaseDate().toString());
        io.print(dvd.getMpaaRating());
        io.print(dvd.getDirectorsName());
        io.print(dvd.getStudio());
        io.print(dvd.getUserRating());

How can I parse/format dates with LocalDateTime? (Java 8)

Parsing date and time

To create a LocalDateTime object from a string you can use the static LocalDateTime.parse() method. It takes a string and a DateTimeFormatter as parameter. The DateTimeFormatter is used to specify the date/time pattern.

String str = "1986-04-08 12:30";
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");
LocalDateTime dateTime = LocalDateTime.parse(str, formatter);

Formatting date and time

To create a formatted string out a LocalDateTime object you can use the format() method.

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");
LocalDateTime dateTime = LocalDateTime.of(1986, Month.APRIL, 8, 12, 30);
String formattedDateTime = dateTime.format(formatter); // "1986-04-08 12:30"

Note that there are some commonly used date/time formats predefined as constants in DateTimeFormatter. For example: Using DateTimeFormatter.ISO_DATE_TIME to format the LocalDateTime instance from above would result in the string "1986-04-08T12:30:00".

The parse() and format() methods are available for all date/time related objects (e.g. LocalDate or ZonedDateTime)

How to convert LocalDate from one format to another LocalDate format in java 8 without using String date?

This feature is not a responsibility of LocalDate class which is an immutable date-time object that represents a date. Its duty is not to care about the String format representation.

To generate or parse strings, use the DateTimeFormatter class.

DateTimeFormatter pattern = DateTimeFormatter.ofPattern("dd-MM-yyyy");
String string = date.format(pattern);

Back to LocalDate, use the same pattern:

LocalDate dateParsed = LocalDate.parse(string, pattern);

But the new dateParsed will again be converted to its default String representation since LocalDate overrides toString() method. Here is what the documentation says:

The output will be in the ISO-8601 format uuuu-MM-dd.

You might want to implement your own decorator of this class which handles the formatting.

convert from localdate to string in spring boot

The error message describes the issue. Method .format is absent at Stream interface. see https://docs.oracle.com/javase/8/docs/api/java/util/stream/Stream.html
I think that you want to transform the object to string and concatenate it. So:

String StartDate = datesRequests.stream().map(DatesRequest::getStartDate).map(date -> DateTimeFormatter.ofPattern("dd/MM/yyyy").format(date)).collect(Collectors.joining(","));

How to format LocalDate to ISO 8601 with T and Z?

Never format the java.time types using SimpleDateFormat

Using the SimpleDateFormat, you are supposed to format only legacy date-time types e.g. java.util.Date. In order to format the java.time date-time types, you need to use DateTimeFormatter.

Never enclose Z within single quotes

It's a blunder to enclose Z within single quotes in a format. The symbol Z stands for zulu and specifies UTC+00:00. If you enclose it within single quotes, it will simply mean character literal, Z and won't function as UTC+00:00 on parsing.

You do not need to use a formatter explicitly

For this requirement, you do not need to use a formatter explicitly because the OffsetDateTime#toString already returns the string in the format that you need. However, if the number of seconds in an OffsetDateTime object is zero, the same and the subsequent smaller units are truncated by OffsetDateTime#toString. If you need the full format irrespective of the value of seconds, then, of course, you will have to use DateTimeFormatter.

import java.time.LocalDate;
import java.time.Period;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
import java.util.Random;

public class Main {
    public static void main(String[] args) {
        System.out.println(generateRandomDateAndTimeInString());
    }

    public static String generateRandomDateAndTimeInString() {
        LocalDate date = LocalDate.now().minus(Period.ofDays((new Random().nextInt(365 * 70))));
        System.out.println("date and time :: " + date.toString());
        return formatDate(date);
    }

    public static String formatDate(LocalDate date) {
        DateTimeFormatter dtf = DateTimeFormatter.ofPattern("uuuu-MM-dd'T'HH:mm:ssX");
        // return date.atStartOfDay().atOffset(ZoneOffset.UTC).toString();
        return date.atStartOfDay().atOffset(ZoneOffset.UTC).format(dtf);
    }
}

A sample run:

date and time :: 1996-09-05
1996-09-05T00:00:00Z

Note that the date-time API of java.util and their formatting API, SimpleDateFormat are outdated and error-prone. It is recommended to stop using them completely and switch to the modern date-time API.

• For any reason, if you have to stick to Java 6 or Java 7, you can use ThreeTen-Backport which backports most of the java.time functionality to Java 6 & 7.
• If you are working for an Android project and your Android API level is still not compliant with Java-8, check Java 8+ APIs available through desugaring and How to use ThreeTenABP in Android Project.

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

If you still need to use SimpleDateFormat for whatsoever reason:

Convert LocalDate to ZonedDateTime with ZoneOffset.UTC and at the start of the day ➡️ Convert ZonedDateTime to Instant ➡️ Obtain java.util.Date object from Instant.

public static String formatDate(LocalDate date) {
    Date utilDate = Date.from(date.atStartOfDay(ZoneOffset.UTC).toInstant());
    DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssX");
    return dateFormat.format(utilDate);
}

how to convert LocalDate to a specific date time format

I am assuming that have got a string, for example 2016-01-25, and that you want a string containing the start of the day in the JVM’s default time zone (it wasn’t clear from the question). I first define a formatter for the format that you want (it’s ISO 8601):

private static DateTimeFormatter formatter
        = DateTimeFormatter.ofPattern("uuuu-MM-dd'T'HH:mm:ss.SSSxx");

Now your conversion goes:

    String isoLocalDateString = "2016-01-25";
    LocalDate date = LocalDate.parse(isoLocalDateString);
    ZonedDateTime dateTime = date.atStartOfDay(ZoneId.systemDefault());
    String dateTimeString = dateTime.format(formatter);
    System.out.println(dateTimeString);

When running in my time zone, Europe/Copenhagen, output from this example code is what you asked for:

2016-01-25T00:00:00.000+0100

In rare cases where summer time (DST) begins at the first moment of the day, the time of day will not be 00:00:00.000.

For parsing with ISO_LOCAL_DATE we don’t need to specify the formatter since this formatter is the default for LocalDate.parse().

All of this said, you should not normally want to convert a date from one string format to another string format. Inside your program keep dates as LocalDate objects. When you get string input, parse into a LocalDate. Only when you need to give string output, for example in data exchange with another system, format into a string in the required format.

Link: Wikipedia article: ISO 8601

---

Related Topics