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    <p>The OP answered this question to change the default timezone for a single instance of a running JVM, set the <code>user.timezone</code> system property:</p> <pre><code>java -Duser.timezone=GMT ... &lt;main-class&gt; </code></pre> <p>If you need to set specific time zones when retrieving Date/Time/Timestamp objects from a database <code>ResultSet</code>, use the second form of the <code>getXXX</code> methods that takes a <code>Calendar</code> object:</p> <pre><code>Calendar tzCal = Calendar.getInstance(TimeZone.getTimeZone("GMT")); ResultSet rs = ...; while (rs.next()) { Date dateValue = rs.getDate("DateColumn", tzCal); // Other fields and calculations } </code></pre> <p>Or, setting the date in a PreparedStatement:</p> <pre><code>Calendar tzCal = Calendar.getInstance(TimeZone.getTimeZone("GMT")); PreparedStatement ps = conn.createPreparedStatement("update ..."); ps.setDate("DateColumn", dateValue, tzCal); // Other assignments ps.executeUpdate(); </code></pre> <p>These will ensure that the value stored in the database is consistent when the database column does not keep timezone information.</p> <p>The <code>java.util.Date</code> and <code>java.sql.Date</code> classes store the actual time (milliseconds) in UTC. To format these on output to another timezone, use <code>SimpleDateFormat</code>. You can also associate a timezone with the value using a Calendar object:</p> <pre><code>TimeZone tz = TimeZone.getTimeZone("&lt;local-time-zone&gt;"); //... Date dateValue = rs.getDate("DateColumn"); Calendar calValue = Calendar.getInstance(tz); calValue.setTime(dateValue); </code></pre>
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    1. POForce Java timezone as GMT/UTC
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    1. USKevin Brock
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    1. POForce Java timezone as GMT/UTC
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    1. COOne thing to note about setting the timezone for the entire JVM is that it affects everything, including such things as logging. Just something to keep in mind if that's the desired effect.
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      1. USHermann Hans
    2. COYep, that fine. Just one point to mention, that I actually set the user.timezone directly in code, rather then via the -D parameter.
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      1. USSyBer
    3. CO@SyBer: That works but you must ensure that you set this before any method calls the TimeZone.getDefault() method. If not you will have some confusion since the default is cached after the first execution. This also means it could be a problem if you do this inside an API/library (hidden from plain view) - be sure to document heavily what you are doing.
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