First commit.

README.md

@@ -0,0 +1,6 @@
+
+Example
+-------
+
+    curl -H "Authorization: Basic geoloqi:api" "http://timezone-api.geoloqi.com/timezone?latitude=45.5118&longitude=-122.6433"
+

cli.php

@@ -0,0 +1,18 @@
+<?php
+include('inc.php');
+
+$db = new PDO(PDO_DSN, PDO_USER, PDO_PASS, array(PDO::ATTR_PERSISTENT => false));
+
+$timezone = timezoneFromLocation($argv[1], $argv[2]);
+
+if($timezone) {	
+	$tz = new DateTimeZone($timezone);
+	$now = new DateTime(date('c'));
+	$now->setTimeZone($tz);
+
+	echo "timezone: " . $timezone . "\n";
+	echo "offset:   " .  $now->format('P') . "\n";
+	echo "seconds:  " . (int)$now->format('Z') . "\n";
+} else {
+	echo "No data found for " . $argv[1] . ", " . $argv[2] . "\n";
+}

import.php

@@ -0,0 +1,33 @@
+<?php
+include('inc.php');
+
+$db = new PDO(PDO_DSN, PDO_USER, PDO_PASS, array(PDO::ATTR_PERSISTENT => false));
+
+
+/*
+$query = $db->prepare('CREATE TABLE "timezone" (
+	"id" SERIAL,
+	"location" "geography",
+	"timezone" varchar(100)
+)');
+$query->execute();
+
+$query = $db->prepare('ALTER TABLE "timezone" OWNER TO gisgroup');
+$query->execute();
+*/
+
+
+$data = file('tz_cities.txt');
+
+foreach($data as $line) {
+	if(preg_match('/([0-9\.-]+) ([0-9\.-]+) (.+)/', $line, $match)) {
+		$latitude = $match[1];
+		$longitude = $match[2];
+		$timezone = trim($match[3]);
+
+		echo $latitude . ', ' . $longitude . "\t" . $timezone . "\n";
+		$query = $db->prepare('INSERT INTO timezone (location, timezone) VALUES (ST_GeographyFromText(\'SRID=4326;POINT(' . $longitude . ' ' . $latitude . ')\'), \'' . $timezone . '\')');
+		$query->execute();
+	}
+}
+

inc.php

@@ -0,0 +1,45 @@
+<?php
+define('PDO_DSN', 'pgsql:dbname=timezone;host=127.0.0.1');
+define('PDO_USER', 'loqi');
+define('PDO_PASS', 'tinydino');
+
+function timezoneFromLocation($latitude, $longitude) {
+	global $db;
+
+	$result = FALSE;
+
+	// First check for cities within 100km
+	$timezones = $db->prepare("SELECT timezone FROM timezone WHERE ST_DWithin(ST_GeographyFromText('SRID=4326;POINT(" . $longitude . ' ' . $latitude . ")'), location, 100000, false) order by st_distance(ST_GeographyFromText('SRID=4326;POINT(" . $longitude . ' ' . $latitude . ")'), location) LIMIT 1");
+	$timezones->execute();
+
+	while($tz = $timezones->fetch()) {
+		$result = $tz['timezone'];
+	}
+
+	// $latN = $latitude - 1 % 180;
+	// $latS = $latitude + 1 % 180;
+	// $lngE = $longitude + 1 % 360;
+	// $lngW = $longitude - 1 % 360;
+
+	// $timezones = $db->prepare("SELECT timezone FROM timezone WHERE lat > $latN AND lat <= $latS AND lng > $lngW AND lng < $lngE ORDER BY st_distance(ST_GeographyFromText('SRID=4326;POINT(" . $longitude . ' ' . $latitude . ")'), location) LIMIT 1");
+	// $timezones->execute();
+	// while($tz = $timezones->fetch()) {
+	// 	$result = $tz['timezone'];
+	// }
+
+	if($result)
+		return $result;
+
+	// If nothing found that close, check again within 6000km
+	$timezones = $db->prepare("SELECT timezone FROM timezone WHERE ST_DWithin(ST_GeographyFromText('SRID=4326;POINT(" . $longitude . ' ' . $latitude . ")'), location, 6000000, false) order by st_distance(ST_GeographyFromText('SRID=4326;POINT(" . $longitude . ' ' . $latitude . ")'), location) LIMIT 1");
+	$timezones->execute();
+	while($tz = $timezones->fetch()) {
+		$result = $tz['timezone'];
+	}
+
+	return $result;
+}
+
+function get($k) {
+	return array_key_exists($k, $_GET) ? $_GET[$k] : FALSE;
+}

index.php

@@ -0,0 +1,37 @@
+<?php
+include('inc.php');
+
+if(preg_match('|^/timezone/([0-9\.-]+)/([0-9\.-]+)$|', $_SERVER['REQUEST_URI'], $match) || (get('latitude') && get('longitude'))) {
+	$db = new PDO(PDO_DSN, PDO_USER, PDO_PASS, array(PDO::ATTR_PERSISTENT => TRUE));
+
+	$latitude = get('latitude') ?: $match[1];
+	$longitude = get('longitude') ?: $match[2];
+
+	$timezone = timezoneFromLocation($latitude, $longitude);
+
+	header('Content-type: application/json');
+
+	if($timezone) {
+		$tz = new DateTimeZone($timezone);
+		$now = new DateTime(date('c'));
+		$now->setTimeZone($tz);
+
+		echo json_encode(array(
+			'timezone' => $timezone,
+			'offset' => $now->format('P'),
+			'seconds' => (int)$now->format('Z')
+		));
+	} else {
+		echo json_encode(array(
+			'error' => 'no_data'
+		));
+	}
+
+} else {
+	header('HTTP/1.1 404 Not Found');
+	header('Content-type: application/json');
+	echo json_encode(array(
+		'error' => 'not_found'
+	));
+}
+