Where to perform date conversion for display?

Hi,
We have started our application with operation for single country, all data located in single database. The transaction history time stored is all in GMT+8.
However, with business expansion, we now have to cater for multiple country that is of different timezone. I need to display the transaction history in local time to the user of the different timezone.
Gut feel says i should continue to store all the time in a single timezone (i.e. probably GMT+8 for my case). And perform conversion during for the display.
Question is where should i be doing this? I am using Struts for web tier, EJB and Mysql. Based on MVC pattern, it seems that this should be done in Struts layer (probably DispatchAction).
Any recommended pattern? Any idea how to handle daylight saving?

Yes, you should store all your timestamps in the same timezone. And it would be best if your database server uses the same timezone as your application server, otherwise you could run into problems.
Now, the java.util.Date object and its SQL relative java.sql.Timestamp consist only of a single number, which is the number of milliseconds since a certain point in time. Normally they are what you get from the database. The thing to remember about them is that they do not have a timezone. As you suspect, displaying them applies a timezone to them. If the displaying is done by SimpleDateFormat -- which it should be, whether you do it in code or Struts does it -- you just need to make sure that the SimpleDateFormat has been assigned the correct timezone. This takes care of daylight savings time as well.
Finding out what timezone your users are in may be more tricky than you expect, but this depends on where they are located. You can't necessarily derive a timezone from a country, so you may have to ask the user what their timezone is.

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Date conversion for display

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emm wrote:
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Where to perform date conversion for display?

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