[DISCUSS} Server TimeZone

[Craig L Russell]

Here is a proposal to add the ability of a user to get the time at the server in a portable way.

<proposed>
11.1
...


12.17 Server Date
java.util.Date getServerDate();


</proposed>

Craig Russell
Architect, Sun Java Enterprise System http://java.sun.com/products/jdo
408 276-5638 mailto:[EMAIL PROTECTED]
P.S. A good JDO? O, Gasp!

This should allow an application to avoid time skew by using the time as seen by a single source, the server to which the PersistenceManagerFactory is connected. ServerTimeZoneID: the time zone ID of the server to which this PersistenceManagerFactory is connected, for use with the PersistenceManager method getServerDate If ServerTimeZoneID is specified, the value must correspond to a valid time zone ID as returned by TimeZone.getAvailableIDs(). The implementation uses the ServerTimeZoneID to implement the getServerDate method. If ServerTimeZoneID is not specified, the implementation might use proprietary methods to determine the time zone in which the server is located. If ServerTimeZoneID is not specified, and the implementation cannot or does not use proprietary methods to determine the server time zone, then the default time zone ID of the Java VM is used. Time skew is a phenomenon in which machines connected together in client/server configurations might have clocks that are not perfectly synchronized, and the time as seen by different clients might differ. In order for the application to avoid time skew, this method can be used to acquire a Date instance corresponding to the UTC Date as seen by the server. Clients using this method can order their operations according to a single time source. Implementations use the setting of the server time zone to prepare a Date instance that represents UTC time on the server.

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