How Can I Properly Handle Time Zones When Using java.sql.Timestamp with JDBC?

Understanding the Time Zone Considerations for java.sql.Timestamp

When utilizing java.sql.Timestamp for storing and retrieving timestamps in a database, it's crucial to consider the impact of time zones on the data.

Time Zone Handling in JDBC

By default, if a Timestamp object is set using setTimestamp(int, Timestamp) without specifying a Calendar object, the JDBC driver utilizes the time zone of the virtual machine running the application. This implies that the stored timestamp in the database might not reflect the intended time zone.

Storing UTC Timestamps

To ensure that UTC timestamps are correctly stored in the database, a Calendar object must be provided to setTimestamp(int, Timestamp, Calendar) with the desired time zone. For UTC, this can be achieved as follows:

Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
stmt.setTimestamp(11, tsSchedStartTime, cal);

Impact on Output

By disregarding time zone considerations, the code provided incorrectly stores the UTC timestamp as a local timestamp. This can lead to discrepancies when retrieving the data from the database, as it will be interpreted based on the time zone of the current application.

Local Timezone Impact on Timestamp.toString()

The Timestamp.toString() method, similar to java.util.Date, prints the timestamp based on the local timezone of the virtual machine. It doesn't reflect the time zone of the stored value.

JDBC 4.2 Solution

JDBC 4.2 introduces support for java.time.LocalDateTime and java.time.LocalTime for TIMESTAMP and TIME data types. These classes are timezone-agnostic, eliminating the need for explicit time zone conversions.

The above is the detailed content of How Can I Properly Handle Time Zones When Using java.sql.Timestamp with JDBC?. For more information, please follow other related articles on the PHP Chinese website!