Can we explain why it is in the spec that way? No. It probably has to do with quantum logic or devine intervention or something (it makes no sense).
Anyway, with the complete experience we have now on the subject, we know that the default should not be GMT, nor the system time zone (which is a difficult concept for a webapp), but something else: null. When a converter is used with timeZone="null", it should use the timeZone of the provided Date to format, and the system timeZone in parsing, creating a Date with the system timeZone. But the system time zone only in the absence of a user timeZone, similar to the user locale (to be set or gottten from the UIViewRoot).
Anyway, to complete the story, setting timeZone="CET" on all converters didn't really work in the end. Suddenly the reverse problem popped up, and turned out to be that the tomcat user, under which the webapp was deployed on a second server, had it's timeZone set to GMT. We ended up creating a custom converter anyway, and the hell with the spec. Should have done that much earlier.
On 14 Oct 2005, at 23:13, Travis Reeder wrote:
Can someone explain why the default will set the timezone to GMT rather than the system timezone as one would generally expect?<x-tad-smaller>Met vriendelijke groeten,
Travis
On 9/30/05, Volker Weber <[EMAIL PROTECTED]> wrote:
After thinking about the GMT problem again i changed my mind.
The last weeks patch was the right way.
And i also found the reason for the different behavior of h:inputText
and h:outputText in my example.
I was wondering why the h:outputText doesn't use a converter, but i was
overlooking that the value of the h:outputText is not a Date object.
It's a String concatenated of two vb expressions.
jsf spec says evaluation of those expression is made according to jsp
2.0 spec. And jsp spec doesn't know anything about converters and makes
just toString(). The Dates toString() uses system timeZone, and so i got
this problem.
So i split the h:outputText :
<h:outputText
value="#{example_messages['date_comp_text6']} "/>
<h:outputText value="#{date3}">
<f:convertDateTime type="both"/>
</h:outputText>
and got the expected output.
Here i need to add the converter, because the default type is date only.
Regards
Volker Weber wrote:
> Hi,
>
> the javadoc says:
> public java.util.TimeZone getTimeZone()
>
> Return the TimeZone used to interpret a time value. If not
> explicitly set, the default time zone of GMT returned.
>
> so we can't change this.
>
> but i think (now) the patch we applied last week was the wrong solution.
>
> Instead of changing getAsString() to use getTimeZone() for setting the
> timeZone to the DateFormat, getAsObject() shouldn't do this.
>
> Of cause getAsString() and getAsObject() must use the same TimeZone,
> which was not the case last week.
>
> The following is taken and light modified from date.jsp in simple example:
>
> <h:inputText value="#{date3}">
> <f:convertDateTime type="both"/>
> </h:inputText>
> <f:verbatim><br></f:verbatim>
> <h:outputText value="#{example_messages['date_comp_text6']} #{date3}"/>
>
> The time differs in <h:inputText ../> and <h:outputText ../> cause of
> the GMT default in the converter. And around midnight also the date may
> differ.
>
> I'm shure this is not the expected behavior. But i'm not shure if this
> is not a problem in the h:outputText, shoudn't there also used the
> converter to convert the java.util.Date to string?
>
>
> But to be in sync with output generated by jsp the converter shoudn't
> use getTimeZone() but _timeZone.
>
>
> We should undo the patch from last week and change getAsObject()
> accordingly.
>
>
>
>
>
> ir. ing. Jan Dockx wrote:
>
>>I believe the default is the cause of all problems. I think the default
>>needs to be the systems time zone. But not sure yet.
>>
>>
>>On 29 Sep 2005, at 22:54, Mike Kienenberger wrote:
>>
>> This sounded vaguely familiar. I think it's been fixed.
>>
>> http://issues.apache.org/jira/browse/MYFACES-506?page=all
>> DateTimeConverter.getTimeZone should return the default time of the
>> GMT zone by default
>>
>>
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