- We would like to get/set the default timezone in java.
- TimeZone represents a time zone offset, and also figures out daylight savings.
- We will use package java.util.TimeZone to get/set default time zone.
1. Important methods of TimeZone class
| Method Name | Description |
|---|---|
| static TimeZone getDefault() | Gets the default TimeZone of the Java virtual machine. |
| static TimeZone getTimeZone(String ID) | Gets the TimeZone for the given ID. |
| static void setDefault(TimeZone zone) | Sets the TimeZone that is returned by the getDefault method. |
| String getDisplayName() | Returns a long standard time name of this TimeZone suitable for presentation to the user in the default locale. |
| String getID() | Gets the ID of this time zone. |
| abstract int getRawOffset() | Returns the amount of time in milliseconds to add to UTC to get standard time in this time zone. |
2. Program: Get & Set default timezone of java virtual machine (JVM)
package org.learn;import java.util.TimeZone;public class DemoTimeZone { public static void main(String[] args) { //Get default time zone TimeZone timeZone = TimeZone.getDefault(); System.out.println("1. Default time zone is:"); System.out.println(timeZone); //Setting default time zone System.out.println("2. Setting UTC as default time zone"); TimeZone utcTimeZone = TimeZone.getTimeZone("UTC"); //Setting UTC time zone TimeZone.setDefault(utcTimeZone); //Now get default time zone timeZone = TimeZone.getDefault(); System.out.println(timeZone); System.out.println("3. Exploring properties of timezone object : "); System.out.printf("3.1. DisplayName = %s, ID = %s, offset = %s", timeZone.getDisplayName(),timeZone.getID(),timeZone.getRawOffset()); }} |
3. Output: Get & Set default timezone of java virtual machine (JVM)
1. Default time zone is:sun.util.calendar.ZoneInfo[id="Asia/Calcutta",offset=19800000,dstSavings=0,useDaylight=false,transitions=6,lastRule=null]2. Setting UTC as default time zonesun.util.calendar.ZoneInfo[id="UTC",offset=0,dstSavings=0,useDaylight=false,transitions=0,lastRule=null]3. Exploring properties of timezone object : 3.1. DisplayName = Coordinated Universal Time, ID = UTC, offset = 0 |