Date Conversion from GMT to Local and Local To GMT considering DST.

Hi,
I have a application which displays the time in GMT across all the screens,and saves in Local/Default TimeZone as application would be deployed in europe and India.I have written a utility which does the conversion.
I just want to know that how to handle the Daylight Saving Time[DST] as we are taking the data from database and converting it to LocalTime Zone.This works fine but what would happen if the sever time is changes due to DST.There would be problem between the object saved before the DST and after DST because we are simply converting stored time to GMT to show on the screen.
Please share if you some solution/suggestions.
Thanks.
Akash.

YoungWinston wrote:
jschell wrote:
That statement is phrased oddly.
A java.util.Date uses a UTC offset with millisecond resolution.
A jdbc driver converts that value into a "correct" value for the target database.And from.
The form that is stored in the database is entirely database dependent. The actual form stored in the database can take many forms.True, but it is highly likely to be an offset from some "epoch" (Progress, for example, uses 00:00:00 1/1/-3714 UTC as I recall, and has 1-second granularity).Yes but as I said the phrasing was odd. A timestamp, by definition, must be an offset of something. Doesn't matter how it is represented. After all the year 2009 is an offset in the Gregorian calander.
However in terms of actual storage the way it is stored is unlikely to be similar to what Java does. As examples neither Oracle nor MS SQL Server uses a single numeric offset.
It might not even have a concept of timezone.Again true, although I've yet to come across one; and since OP is only concerned about the timezone in Java I'm not quite sure how relevant that is.
Relevant in terms of the description in terms of what java does, what the database does and how it gets from java to the database.
I would also expect any JDBC driver that cannot translate to or from a Java date correctly to document the fact in 60-point bold type, since it's a violation of the implied contract of ResultSet.getDate().Except that depends on your definition of "correct".
Examples of that
- Oracle doesn't have millisecond resolution at all in its common format.
- MS SQL Server doesn't have the same resolution as java, instead there is an odd resolution (one three-hundredth of a second).
- MS SQL Server doesn't have timezones, so if you don't take care and your data crosses timezones the timestamp will be different.
The drivers will not warn you of things like that. At least not that I have seen.
Format for Oracle.
[http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:77562635789106]
Format for MS SQL Server
[http://msdn.microsoft.com/en-us/library/aa258277(SQL.80).aspx]

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