Re: Displaying Local Time on a Web Client
Re: Displaying Local Time on a Web Client
- Subject: Re: Displaying Local Time on a Web Client
- From: Chuck Hill <email@hidden>
- Date: Tue, 31 Mar 2009 15:55:05 -0700
On Mar 31, 2009, at 3:48 PM, Mr. Pierre Frisch wrote:
Beware that SimpleDateFormat is not reentrant so stashing it
somewhere may not be safe.
WOSession is not re-entrant either so that should be safe.
And please don't use NSTimestampFormatter if you are using local
times it is deprecated and does not work correctly in particular
with daylight saving time and such.
It would work correctly if you fixed it. :-)
Chuck
On Mar 31, 2009, at 9:56, Chuck Hill wrote:
On Mar 31, 2009, at 9:20 AM, David Avendasora wrote:
Okay I know this must be easy, but I just can't seem to get it to
work.
I just want to display the time a particular page was displayed.
My component has this:
CurrentTimestamp : WOString {
value = currentTimestamp;
dateformat ="%m/%d/%y %H:%M";
}
When currentTimestamp returns a new NSTimestamp I get GMT, which
is what I expected.
But when I return an NSTimestamp create like so:
GregorianCalendar calendar = new GregorianCalendar();
calendar.setTime(new NSTimestamp());
NSTimestamp timestamp = new NSTimestamp(calendar.getTimeInMillis(),
TimeZone.getTimeZone("America/Chicago"));
return timestamp;
I still get GMT.
What fundamental thing am I missing or doing wrong?
Gosh, where does does one start? Oh, my. Best sit down, this will
take a while. What, just the date? OK then... ;-)
Use the formatter, not the timestamp to control the time zone it is
shown in. And don't use the dateFormat and numberFormat bindings.
Bad. Or at least don't hard code them. Otherwise you have much to
change when you need to change the format. Better to use the
formatter binding and an instance of java.util.format
(SimpleDateFormat or NSTimestampFormatter). And stash it in your
session for a bit of optimization. But I digress.
That should do it, assuming the client and server are in the same
time zone. If not, you will have to determine the user's time zone
and use that to set the time zone of the formatter. Yet another
good reason to stash it in the session.
Chuck
--
Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems.
http://www.global-village.net/products/practical_webobjects
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--
Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems.
http://www.global-village.net/products/practical_webobjects
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