Strange problem with timezone, calendar and SimpleDateFormat
Solution 1
CEST
is Central European Summer Time. It is the same as CET
with daylight savings into effect.
Solution 2
You can set the default time zone
import java.util.TimeZone;
...
TimeZone.setDefault(TimeZone.getTimeZone("UTC")); // or "Etc/GMT-1"
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss dd/MM/yyyy", Locale.US);
long start = sdf.parse("10:30:00 30/09/2009").getTime();
long end = sdf.parse("10:30:00 30/10/2009").getTime();
Calendar c = Calendar.getInstance(Locale.US);
c.setTimeInMillis(start);
System.out.println("Start = " + c.getTime());
c.setTimeInMillis(end);
System.out.println(" End = " + c.getTime());
use TimeZone.getAvailableIDs()
to see all available IDs.
EDIT: you can also use a new SimpleTimeZone
TimeZone.setDefault(new SimpleTimeZone(60 * 60 * 1000, "CET"));
Romain Linsolas
As a software engineer and specialist in Java / J2EE application development, I am particularly interested in designing and developing high performance JEE applications, and Rich Internet Applications. My specialties: IT Consulting in Java / J2EE development (Spring, Hibernate, JSF, Struts) Web development (XHTML, Javascript, CSS, Ajax) Agile methodologies (Scrum, eXtreme Programming) Unit Testing and Quality, Continuous Integration and Performance
Updated on June 09, 2022Comments
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Romain Linsolas almost 2 years
Let's consider the following code:
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss dd/MM/yyyy", Locale.US); long start = sdf.parse("10:30:00 30/09/2009").getTime(); long end = sdf.parse("10:30:00 30/10/2009").getTime(); Calendar c = Calendar.getInstance(Locale.US); c.setTimeInMillis(start); System.out.println("Start = " + c.getTime()); c.setTimeInMillis(end); System.out.println(" End = " + c.getTime());
When running this code snippet, I have the following output:
Start = Wed Sep 30 10:30:00 CEST 2009 End = Fri Oct 30 10:30:00 CET 2009
Why do I get different timezone ?
Note that if I set the first date in august and the second one in september, the output will display the same timezone in both cases:
long start = sdf.parse("10:30:00 30/08/2009").getTime(); long end = sdf.parse("10:30:00 30/09/2009").getTime();
will display:
Start = Sun Aug 30 10:30:00 CEST 2009 End = Wed Sep 30 10:30:00 CEST 2009
I'm using Java 1.6.0_14