How to set a JVM TimeZone Properly

Question

I am trying to run a Java program  but it is taking a default GMT timezone instead of an OS defined timezone  My JDK version is 1 5 and the OS is Windows Server Enterprise  2007   Windows has a Central timezone specified  but when I run the following program  it gives me a GMT time   import java util Calendar   public class DateTest       public static void main String   args                Calendar now   Calendar getInstance            System out println now getTimeZone             System out println now getTime               Here is the output  sun util calendar ZoneInfo id  GMT   offset 0  dstSavings 0  useDaylight false  transitions 0  lastRule null  Mon Mar 22 13 46 45 GMT 2010   Please note that I do not want to set the timezone from the application  I want that the timezone used by JVM should be the one specified in the OS   I am not finding this issues with other servers that have version 1 4 of JDK and Microsoft Server 2003    Any thoughts would be highly appreciated

User · Answer

On windows 7 and for JDK6  I had to add -Duser timezone  Europe Sofia  to the JAVA TOOL OPTIONS system variable located under  My computer  Properties  Advanced System Settings  Environment Variables     If you already have some other property set for JAVA TOOL OPTIONS just append a space and then insert your property string

User · Answer

If you are using Maven   mvn -Dexec args  -Duser timezone Europe Sofia

User · Answer

The accepted answer above   -Duser timezone  Europe Sofia     Didn t work for me exactly  I only was able to successfully change my timezone when I didn t have quotes around the parameters   -Duser timezone Europe Sofia

User · Answer

Setting environment variable TZ should also works ex  export TZ Asia Shanghai

User · Answer

In win7  if you want to set the correct timezone as a parameter in JRE  you have to edit the file deployment properties stored in path c  users  username  appdata locallow sun java deployment adding the string deployment javaws jre 1 args -Duser timezone  my time zone

User · Answer

You can also set the default time zone in your code by using following code   TimeZone setDefault TimeZone getTimeZone  UTC       To Yours   TimeZone setDefault TimeZone getTimeZone  Europe Sofia

User · Answer

Two options that I don   t think were covered in the other answers   Avoid the need  Whatever you do to set the JVM default time zone  it is very hard to make sure that no one else sets it differently  It can be set at any time without notice from another part of your program or from another program running in the same JVM  So in your time operations be explicit about which time zone you want  and you will always know what you get independently of the JVM setting  Example       System out println ZonedDateTime now ZoneId of  Asia Dushanbe        Example output      2018-10-11T14 59 16 742020 05 00 Asia Dushanbe    System setProperty  For many purposes the following will not be the preferred way  and it can certainly be misused  For    throw away    programs I sometimes find it practical  You can also set a system property from within Java       System setProperty  user timezone    Australia Tasmania        System out println ZonedDateTime now       This just printed      2018-10-11T21 03 12 218959 11 00 Australia Tasmania    If you want validation of the string you are passing  use           System setProperty  user timezone   ZoneId of  Australia Tasmania   getId

User · Answer

You can pass the JVM this param  -Duser timezone   For example  -Duser timezone Europe Sofia   and this should do the trick   Setting the environment variable TZ also does the trick on Linux

[java] How to set a JVM TimeZone Properly

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