java.time.ZonedDateTime Usage Examples

This section provides a tutorial example on how to use the java.time.ZonedDateTime class to record and manipulate date and time local to specific timezones. Operations on java.time.ZonedDateTime objects respect ISO 8601 calendar rules and local timezone rules.

To test out the java.time.ZonedDateTime class, I wrote the following example program, ZonedDateTimeTest.java:

/* ZonedDateTimeTest.java
 - Copyright (c) 2014, HerongYang.com, All Rights Reserved.
 */
import java.time.ZonedDateTime;
import java.time.temporal.ChronoField;
class ZonedDateTimeTest {
   public static void main(String[] a) {
      java.io.PrintStream out = System.out;
      // ZonedDateTime now = new ZonedDateTime(); // not supported

      ZonedDateTime now = ZonedDateTime.now();
      out.println("Current moment of time:");
      out.println("toString() = " + now.toString());
      out.println("getYear() = " + now.getYear());
      out.println("getMonthValue() = " + now.getMonthValue());
      out.println("getDayOfMonth() = " + now.getDayOfMonth());
      out.println("getHour() = " + now.getHour());
      out.println("getMinute() = " + now.getMinute());
      out.println("getSecond() = " + now.getSecond());
      out.println("getNano() = " + now.getNano());
      out.println("getOffset() = " + now.getOffset());
      out.println("getZone() = " + now.getZone());

      ZonedDateTime leap = ZonedDateTime.parse("2012-02-29T12:00:00+01:00[Europe/Paris]");
      out.println();
      out.println("Leap day:");
      out.println("toString() = " + leap.toString());
      ZonedDateTime nextYear = leap.plusYears(1);
      out.println("1 year later:");
      out.println("toString() = " + nextYear.toString());

      ZonedDateTime summer = ZonedDateTime.parse("2014-11-02T01:30:00-04:00[America/Montreal]");
      out.println();
      out.println("Summer hour:");
      out.println("toString() = " + summer.toString());
      ZonedDateTime winter = summer.plusHours(1);
      out.println("1 hour later:");
      out.println("toString() = " + winter.toString());
   }
}

When running ZonedDateTime.java with JDK 1.8, I got the following output:

Current moment of time:
toString() = 2014-04-01T01:48:41.750-04:00[America/New_York]
getYear() = 2014
getMonthValue() = 5
getDayOfMonth() = 1
getHour() = 1
getMinute() = 48
getSecond() = 41
getNano() = 750000000
getOffset() = -04:00
getZone() = America/New_York

Leap day:
toString() = 2012-02-29T12:00+01:00[Europe/Paris]
1 year later:
toString() = 2013-02-28T12:00+01:00[Europe/Paris]

Summer hour:
toString() = 2014-11-02T01:30-04:00[America/Montreal]
1 hour later:
toString() = 2014-11-02T01:30-05:00[America/Montreal]

Interesting notes from the output:

Last update: 2014.

Table of Contents

 About This JDK Tutorial Book

 Downloading and Installing JDK 1.8.0 on Windows

 Downloading and Installing JDK 1.7.0 on Windows

 Downloading and Installing JDK 1.6.2 on Windows

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

 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 - Secret Key Encryption and Decryption

 The SSL (Secure Socket Layer) Protocol

 SSL Socket Communication Testing Programs

 SSL Client Authentication

 HTTPS (Hypertext Transfer Protocol Secure)

 Outdated Tutorials

 References

 PDF Printing Version