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Tip: Time Zone Conversion

Learn how to avoid this common time zone conversion mistake.


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The method below does nothing because the returned Date is exactly the same with the input value.

Always remember that the Date does not carry time zone information, it is always UTC, and the set and get methods convert between UTC and the actual time zone of the Calendar.

public static Date convertTimeZone(Date date, TimeZone timezone) {
   Calendar cal = Calendar.getInstance();
   cal.setTimeZone(TimeZone.getTimeZone("UTC"));
   cal.setTime(date);
   cal.setTimeZone(timezone);
   return cal.getTime();
}

 

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Octavia Andreea Anghel is a senior PHP developer currently working as a primary trainer for programming teams that participate at national and international software-development contests. She consults on developing educational projects at a national level. She is a coauthor of the book "XML Technologies--XML in Java" (Albastra, ISBN 978-973-650-210-1), for which she wrote the XML portions. In addition to PHP and XML, she's interested in software architecture, web services, UML, and high-performance unit tests.
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