Partial Date and Time Objects and Classes

This section provides a tutorial example on how to use Date-Time classes that represents partial date and time objects like java.time.LocalDate, java.time.LocalDate, etc.

The Date-Time API introduced in JDK 1.8 also supports several other classes to represent partial date and time objects. Here is full list of partial date and time object classes:

To test out these partial date and time object classes, I wrote the following example program,

 * Copyright (c) All Rights Reserved.
import java.time.*;
import java.time.temporal.ChronoField;
class PartialDateTimeTest {
   public static void main(String[] a) { out = System.out;

      out.println("Year = " +;
      out.println("YearMonth = " +;
      out.println("MonthDay = " +;
      out.println("LocalDate = " +;
      out.println("LocalTime = " +;
      out.println("LocalDateTime = " +;
      out.println("OffsetTime = " +;

      LocalDate leap = LocalDate.parse("2012-02-29");
      out.println("Leap day:");
      out.println("toString() = " + leap.toString());
      LocalDate nextYear = leap.plusYears(1);
      out.println("1 year later:");
      out.println("toString() = " + nextYear.toString());

      OffsetTime delhi = OffsetTime.parse("12:59:38.000+05:30");
      OffsetTime montreal = OffsetTime.parse("03:29:38.000-04:00");
      out.println("Local times:");
      out.println("Delhi = " + delhi.toString());
      out.println("Montreal = " + montreal.toString());
      out.println("isEqual() = " + montreal.isEqual(delhi));

When running, I got the following output:

herong> javac

herong> java PartialDateTimeTest
Year = 2019
YearMonth = 2019-04
MonthDay = --04-01
LocalDate = 2019-04-01
LocalTime = 22:30:57.292300100
LocalDateTime = 2019-04-01T22:30:57.292300100
OffsetTime = 22:30:57.292300100-04:00

Leap day:
toString() = 2012-02-29
1 year later:
toString() = 2013-02-28

Local times:
Delhi = 12:59:38+05:30
Montreal = 03:29:38-04:00
isEqual() = true

Table of Contents

 About This JDK Tutorial Book

 JDK (Java Development Kit)

Java Date-Time API

 What Is Date-Time API

 java.time.Instant - Representing a Moment of Time

 java.time.Instant Usage Examples

 java.time.Instant - get(INSTANT_SECONDS) Error

 Converting java.util.Date to java.time.Instant

 java.time.ZonedDateTime - Calendar and Timezone

 java.time.ZonedDateTime Usage Examples

 Converting java.util.GregorianCalendar to java.time.ZonedDateTime

 java.time.OffsetDateTime - Calendar and UTC Offset

 java.time.OffsetDateTime Usage Examples

 java.time.LocalDateTime - Local Date and time without Timezone

Partial Date and Time Objects and Classes

 java.time.format.DateTimeFormatter - Date-Time Strings

 java.time.Duration - Time Durations

 java.time.Duration Usage Examples

 java.time.Period - Periods in Days and Months

 java.time.Period Usage Examples

 Date, Time and Calendar Classes

 Date and Time Object and String Conversion

 Number Object and Numeric String Conversion

 Locales, Localization Methods and Resource Bundles

 Calling and Importing Classes Defined in Unnamed Packages

 HashSet, Vector, HashMap and Collection Classes

 Character Set Encoding Classes and Methods

 Character Set Encoding Maps

 Encoding Conversion Programs for Encoded Text Files

 Java Logging

 Socket Network Communication

 Datagram Network Communication

 DOM (Document Object Model) - API for XML Files

 SAX (Simple API for XML)

 DTD (Document Type Definition) - XML Validation

 XSD (XML Schema Definition) - XML Validation

 XSL (Extensible Stylesheet Language)

 Message Digest Algorithm Implementations in JDK

 Private key and Public Key Pair Generation

 PKCS#8/X.509 Private/Public Encoding Standards

 Digital Signature Algorithm and Sample Program

 "keytool" Commands and "keystore" Files

 KeyStore and Certificate Classes

 Secret Key Generation and Management

 Cipher - Encryption and Decryption

 The SSL (Secure Socket Layer) Protocol

 SSL Socket Communication Testing Programs

 SSL Client Authentication

 HTTPS (Hypertext Transfer Protocol Secure)

 Outdated Tutorials


 Full Version in PDF/EPUB