- 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 zone
sun.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
