From 92c7b2717d4cff555ac8037b2b7dc5c59a79f493 Mon Sep 17 00:00:00 2001
From: Georg Ehrke <dev@georgswebsite.de>
Date: Sun, 26 Feb 2012 13:45:20 +0100
Subject: add OC_Geo class

---
 lib/geo.php | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 lib/geo.php

(limited to 'lib/geo.php')

diff --git a/lib/geo.php b/lib/geo.php
new file mode 100644
index 00000000000..a967ab28a96
--- /dev/null
+++ b/lib/geo.php
@@ -0,0 +1,31 @@
+<?php
+/**
+ * Copyright (c) 2012 Georg Ehrke <ownclouddev at georgswebsite dot de>
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ */
+class OC_Geo{
+	/*
+	 * @brief returns the closest timezone to coordinates
+	 * @param (string) $latitude - Latitude
+	 * @param (string) $longitude - Longitude
+	 * @return (string) $timezone - closest timezone
+	 */
+	public static function timezone($latitude, $longitude){	
+		$alltimezones = DateTimeZone::listIdentifiers();
+		$variances = array();
+		//calculate for all timezones the system know
+		foreach($alltimezones as $timezone){
+			$datetimezoneobj = new DateTimeZone($timezone);
+			$locationinformations = $datetimezoneobj->getLocation();
+			$latitudeoftimezone = $locationinformations['latitude'];
+			$longitudeoftimezone = $locationinformations['longitude'];
+			$variances[abs($latitudeoftimezone - $latitude) + abs($longitudeoftimezone - $longitude)] = $timezone;
+		}
+		//sort array and return the timezone with the smallest difference
+		ksort($variances);
+		reset($variances);
+		return current($variances);
+	}
+}
\ No newline at end of file
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