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POBefore writing a Java Date to an SQL TIMESTAMP column, does JDBC translate the date from the JVM time zone to the database session time zone?
 

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  1. POBefore writing a Java Date to an SQL TIMESTAMP column, does JDBC translate the date from the JVM time zone to the database session time zone?
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    <p>Before writing a Java <a href="http://download.oracle.com/javase/6/docs/api/java/util/Date.html" rel="noreferrer">Date</a> to an SQL <a href="http://www.postgresql.org/docs/9.0/interactive/datatype-datetime.html" rel="noreferrer">TIMESTAMP</a> column, does <a href="http://en.wikipedia.org/wiki/Java_Database_Connectivity" rel="noreferrer">JDBC</a> translate the date from the Java virtual machine time zone to that of the database session?</p> <p>For example, suppose the Java virtual machine time zone is <a href="http://en.wikipedia.org/wiki/UTC%C2%B10" rel="noreferrer">UTC</a> and the database session time zone is <a href="http://en.wikipedia.org/wiki/UTC%E2%88%9205:00" rel="noreferrer">UTC-5</a>. If a Java program attempts to store <code>2000-01-01 00:00:00</code> by passing it to <a href="http://download.oracle.com/javase/6/docs/api/java/sql/PreparedStatement.html#setTimestamp(int,%20java.sql.Timestamp)" rel="noreferrer"><code>PreparedStatement#setTimestamp(int, Timestamp)</code></a>, according to the JDBC standard, will the database store <code>TIMESTAMP '2000-01-01 00:00:00'</code> or <code>TIMESTAMP '1999-12-31 19:00:00'</code>?</p>
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      1. POBefore writing a Java Date to an SQL TIMESTAMP column, does JDBC translate the date from the JVM time zone to the database session time zone?
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    1. COTimezones are (or should be) only relevant for presentation of dates, not for storage. So no translation should occur. However this is surmise, not an answer.
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      1. USRedGrittyBrick
    2. COSo RedGrittyBrick, you expect the database to store `TIMESTAMP '2000-01-01 00:00:00'`?
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    3. CORedGrittyBrick, time zone is relevant for dates if you store the time zone. An SQL TIMESTAMP column doesn't store the time zone, though, so it makes sense to store dates independent of location (that is, relative to the UTC time zone).
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      1. USDerek Mahar
 

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