On Sun, Oct 21, 2012 at 12:01 PM, Maciek Sokolewicz
<maciek.sokolew...@gmail.com> wrote:
> On 21-10-2012 01:11, Karl DeSaulniers wrote:
>>>> Thanks for the response. Yes, for the US I plan on calculating by
>>>> state, but
>>>> this website is not geared to just the US.
>>>> So I am looking for a solution that lets me also calculate by
>>>> country/region.
>>>> Was looking on google and found geoip, but not sure if this will do
>>>> the job
>>>> I am looking for.
>>>> Anyone with experience on geoip that can send pointers?
>>>> Thanks,
>>>> Best,
>>>> Karl DeSaulniers
>>>> Design Drumm
>>>> http://designdrumm.com
>>> Geo IP is based on IP, and I must warn you that IP data is not always
>>> accurate. Especially here in Europe, companies that are based in
>>> multiple countries sometimes only register their IPs in a single
>>> country, and share them between all the countries they are active in.
>>> This will give you wrong data from GeoIP. The time difference will
>>> only be 1 hour at max, but still.
>> That was what my own suspicions were leading to.
>> I am familiar with the fact that ips can be spoofed.
>> Thanks for the corroboration.
>> Best,
>> Karl DeSaulniers
>> Design Drumm
>> http://designdrumm.com
> As Bart said, IP is not ideal for this situation.
> Since you do have information about the location of that person (as in
> country and possible state), you can find out the timezone via a static
> database.
> The HTML5 geolocation tool is nice, and would certainly help a lot! However,
> be aware of the fact that it only works if there is the device on which the
> browser runs actually has the ability to find out its location. Many
> smartphones have GPS chips, but most PCs don't. Asking a PC "where are you
> located?" the PC will answer "How should I know?".
> Luckily for you, the way of country and state is pretty easy. I've handed
> you a list to find it in the USA. For most countries in the world, there's a
> simple 1:1 mapping of timezone and country
> (http://en.wikipedia.org/wiki/List_of_time_zones_by_country), there are
> however 21 countries which have multiple timezones. In these cases, you'll
> need extra information to be able to distinguish between them.
> For the USA, you already have a way.
> For (ex-)colonical islands and such (such as for France), you could always
> add them to the country list:
> - France
> - France (Marquesas Islands)
> - France (Gambier)
> etc.
> Thus treating them as separate countries for your timezone db.
> In Russia, Canada, Australia, New Zealand, Brasil, Indonesia, Kiribati,
> Mexico,Congo, Ecuador, Micronesia, Kazakhstan and Mongolia you'll need to
> know their province / state to more accurately assess the ideal timezone.
> So for most countries, it's a simple 1:1 translation. For the above
> countries, you'll need some extra info, and translate further based on that.
> You should be able to find the info required yourself, it just takes a while
> to collect it.
> Alternatively, and this is the most simple way; since you're asking people
> for their country and such, simply also ask them about their timezone. Don't
> bother automating and putting a heck of a lot of time into hard to realize
> solutions, when you can ask a very simple and easy-to-answer question to the
> browser instead. :)
> - Tul

Don't forget that some countries have DST, and some don't. And those
that have DST, all use different dates.. So in to keep a static
database you would also need to have DST info from all countries.

- Matijn

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