Stephen,
Thanks for the feedback. I had looked over the API and had a feeling
joda-time wouldn't help with most of this. I haven't looked at
joda-time-I18N yet. Thanks for the suggestion, I'll check it out.
So are Territory IDs only two character country codes? Or do things like
"America", "Africa", etc. work as well?
I don't see joda-time-i18n available via maven. Is it not stable enough to
use in production?
Also, how's Joda Money coming along? Any reason to not use it in production?
I need a money implementation and it looks really good. Debating between it
and Martin Fowler's implementation in one of his books.
Thanks again,
Tauren
On Tue, Nov 30, 2010 at 3:09 AM, Stephen Colebourne <scolebou...@joda.org>wrote:
> There are lots of good ideas here. There is no way to get groups of
> zones from joda-time though.
>
> One thing to look at is joda-time-I18N, which uses the CLDR data to
> provide some nice methods for managing time zone information including
> the most important zone per territory. Probably not enough for you,
> but it may help.
> Stephen
>
> On 30 November 2010 10:32, Tauren Mills <tau...@groovee.com> wrote:
> > I'd like to implement a UX that makes selecting an appropriate timezone
> very
> > simple. This is for a web application, but could be for any application.
> > When a user creates a profile, they need to select or verify their
> current
> > timezone. Instead of presenting the user with a massive list of 500+
> zones
> > from DateTimeZone.getAvailableIDs(), I want to present them with a few
> very
> > likely options, with the most likely timezone already selected. Of course
> > there will still be a way for them to select "Other" to select from all
> > available timezones.
> > Here's how I see it working:
> > 1. Application server is accurately set to UTC and runs ntpdate regularly
> > 2. Web client detects user's current local time and passes it to the
> server
> > 3. Server attempts to determine timezone in several different ways:
> > A. Given the current server time in UTC and the user's current time
> in
> > some unknown timezone, generate a list of potential timezones
> > B. Server performs a timezone lookup based on IP address of
> > user (
> http://stackoverflow.com/questions/2763263/how-to-get-clients-timezone-offset-from-his-ip-address
> )
> > C. If user allows it, server performs an HTML5 geo-location and
> > determines timezone from lat/long
> > (
> http://stackoverflow.com/questions/41504/timezone-lookup-from-latitude-longitude
> )
> > 4. Server combines the results of options A, B, and C to generate a short
> > list of potential timezones the user is within, ordered from most likely
> to
> > least likely with most likely selected.
> > 5. User is presented with this short list of timezones, with most
> probable
> > selected and an "Other" option to pick from the entire list
> > In fact, I could see the UI looking something like the following site,
> but
> > simplified. The list would be comprised of many of the same timezone
> > aliases, such as "America/Los_Angeles", "America/Vancouver",
> > "America/Tijuana", etc. Your current time would be shown along with the
> > current time in each timezone. Each timezone alias would be selectable,
> with
> > the top most selected by default:
> > http://everytimezone.com/
> > Obviously, the user's time is likely to be inaccurate -- certainly not
> the
> > same as the server's time. And there is the delay between when the time
> is
> > taken on the client and sent to the server for processing. So the logic
> > would assume that the time sent from the client could be off by minutes.
> The
> > closer their time is to accurate, the more precise the suggested
> timezones
> > would be. I'm not worried about those users who's clock is completely
> wrong.
> >
> > Just thought I'd ask for suggestions or comments before beginning
> > implementation. Sorry if this is slightly off-topic, but it does pertain
> to
> > some specific Joda questions:
> > 1. Are there any features of JodaTime that would significantly simplify
> or
> > help with step 3A above?
> > 2. Is there a way to get a list of timezone "groups" from Joda (such as
> > "Africa", "America", "US", "Etc", and so forth)? This would allow
> timezones
> > from "America" to be preferred over "US", as the US zones would not be
> given
> > as options.
> > 3. Any suggestions on how to best integrate timezone "preference"
> > information? For instance, as of today, it is better for a user to pick
> > "America/Los_Angeles" than it is to pick "US/Pacific", "PST8PDT",
> > "UTC-08:00", or "GMT+08:00". I'd like to only show the "preferred"
> > timezones.
> > 4. Any suggestions on how to best integrate timezone "usage" or
> "population"
> > information? For instance, if it is 12:00 noon local time and the server
> > says it is 20:00, then options for UTC--8:00 should be shown. But I'd
> like
> > to show "America/Los_Angeles" before "Pacific/Pitcairn".
> > 5. Are there any serious flaws I haven't considered in this approach?
> > Thanks,
> > Tauren
> >
> >
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