JSF convertDateTime renders the previous day

A date (as the Date temporal type) is stored in my DB like this: 31.10.2012 When I display it in the UI, it is rendered like this per default: 2012-10-31 I convert it using <f:convertDateTime pattern="dd.MM.yyyy" /> and unexpectedly it turns to 30.10.2012

The SimpleDateconverter, fed with the same date and the same format string returns 31.10.2012, as expected.

What am I missing?

Thank you

EDIT : for dates stored as Timestamp the same conversion yields correct results, so I suppose it has something to do with the Date interpreted as the exact midnight which in turn might be interpreted to belong to 2 different days. But I still have no clue where to define the behaviour and what would be the best workaround.


This is undoubtedly a timezone-related issue.

JSF defaults to GMT (UTC) in date/time conversion. So if your server platform default timezone is GMT+X (not GMT-X), then the time will go back in the past X-amount of hours. If the time is already 00:00:00 (midnight), then the date will even go back one day in the past.

There are 2 standard ways to achieve your functional requirement anyway:

  1. Tell JSF to use the server platform default timezone instead for all date/time conversion by adding the following context parameter to web.xml:

  2. Alter every <f:convertDateTime> to explicitly specify the webapp-specific timezone. As you're based in Germany and the date format pattern also confirms this, I'll assume CET.

    <f:convertDateTime ... timeZone="CET" />

In any case, using a non-universal or even mixed timezone throughout the application is not recommendable. It's recommend to set the timezone in all layers and environments to UTC. Not only in the server and front end tier and presentation layer, but also in the SQL database and back end tier and persistence layer. This way the code is not sensitive to timezone and DST(!) related matters and you can just focus on altering the timezone during presentation only, if necessary.

See also:

Need Your Help

Sending int via socket from Java to C - strange results

java c sockets network-programming

I have a simple server written in Java, that just sends an Integer to a connected client. I have a client written in C, that connects to the server and prints out the received Integer.

Is there any way to force a model to be revalidated in an MVC3 controller?

asp.net-mvc-3 validation controller

I have a Model which contains an Address and Person twice, once for the "main" contact, and once for the "invoice" contact, and a boolean value called InvoiceContactSameAsMain - a clumsy name, but

About UNIX Resources Network

Original, collect and organize Developers related documents, information and materials, contains jQuery, Html, CSS, MySQL, .NET, ASP.NET, SQL, objective-c, iPhone, Ruby on Rails, C, SQL Server, Ruby, Arrays, Regex, ASP.NET MVC, WPF, XML, Ajax, DataBase, and so on.