使用每个国家/地区的可用时区填充时区下拉列表？

Question

I just noticed something really nice on the Google Analytics signup page for adding a new domain. First you pick a country them you pick your timezone. Instead of showing a huge Timezone list though they populate the timezone list with only timezones that are available for the country you have selected. I think this is a great idea to make picking a timezone easiar for some users.

So I would like to do this with jQuery since most my other javascript is using jquery already. Has anyone seen any existing jquery script that can do this for me? Or possibly how I can figure out what timezones are in each country?

Answer 1

Can't help with jQuery but for how to figure out what timezones are in each country, you can use DateTimeZone::listIdentifiers() with DateTimeZone::PER_COUNTRY as first argument and the ISO 3166-1 compatible country code as second argument, e.g.

DateTimeZone::listIdentifiers(DateTimeZone::PER_COUNTRY, 'GB');

Note: PHP 5.3 is required.