Possible Wrong Timestamp Information When Oracle Server and JDK Have Conflicting Timezone Information (Doc ID 1941076.1)

Last updated on MARCH 08, 2017

Applies to:

JDBC - Version 11.2.0.1.0 to 12.1.0.2.0 [Release 11.2 to 12.1]
Information in this document applies to any platform.

Symptoms

When inserting timestamps into the database, the timestamp information may be incorrect during occasions when there is a time change, such as Daylight Savings Time (DST). The problem occurs during the hour that is repeated after moving the clock back (for example, between 1 AM and 2 AM).

For example, given an 11.2.0.4 JDBC driver and an 11.2.0.4 database:

In the database, the value for a timestamp column is 1924-03-30 00:00:00.
When writing the same value through JDBC, it is written as 1924-03-29 23:00:00.

In other words, the values differ by an hour.

Cause

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