Improve internal timezone handling

classes/context/Context.class.php

@@ -10,7 +10,7 @@
 class Context
 {
 	/**
-	 * Allow rewrite
+	 * Allow rewritel
 	 * @var bool TRUE: using rewrite mod, FALSE: otherwise
 	 */
 	public $allow_rewrite = FALSE;
@@ -532,7 +532,6 @@ class Context
 		$db_info->time_zone = sprintf('%s%02d%02d', $db_info->time_zone >= 0 ? '+' : '-', abs($db_info->time_zone) / 3600, (abs($db_info->time_zone) % 3600 / 60));
 		$GLOBALS['_time_zone'] = $db_info->time_zone;
 		$GLOBALS['_time_zone_offset'] = $config['locale']['internal_timezone'];
-		$GLOBALS['_qmail_compatibility'] = 'N';
 		$db_info->delay_session = $config['session']['delay'] ? 'Y' : 'N';
 		$db_info->use_db_session = $config['session']['use_db'] ? 'Y' : 'N';
 		$db_info->minify_scripts = $config['view']['minify_scripts'] ? 'Y' : 'N';
@@ -547,7 +546,13 @@ class Context
 		$db_info->use_prepared_statements = $config['use_prepared_statements'] ? 'Y' : 'N';
 		$db_info->use_rewrite = $config['use_rewrite'] ? 'Y' : 'N';
 		$db_info->use_sso = $config['use_sso'] ? 'Y' : 'N';
+		
+		// Save old format to Context instance.
 		self::$_instance->db_info = $db_info;
+		
+		// Set the internal timezone.
+		$internal_timezone = Rhymix\Framework\DateTime::getTimezoneNameByOffset($config['locale']['internal_timezone']);
+		date_default_timezone_set($internal_timezone);
 	}
 
 	/**

common/framework/config.php

@@ -257,15 +257,13 @@ class Config
 		$config['locale']['enabled_lang'] = array_values($lang_selected);
 		
 		// Convert timezone configuration.
-		$old_timezone = intval(get_time_zone_offset($db_info->time_zone ?: '+0900') / 3600);
+		$old_timezone = get_time_zone_offset($db_info->time_zone ?: '+0900');
 		switch ($old_timezone)
 		{
-			case 9:
+			case 32400:
 				$config['locale']['default_timezone'] = 'Asia/Seoul'; break;
-			case 0:
-				$config['locale']['default_timezone'] = 'Etc/UTC'; break;
 			default:
-				$config['locale']['default_timezone'] = 'Etc/GMT' . ($old_timezone > 0 ? '-' : '+') . abs($old_timezone);
+				$config['locale']['default_timezone'] = DateTime::getTimezoneNameByOffset($old_timezone);
 		}
 		$config['locale']['internal_timezone'] = intval(date('Z'));
 		

common/framework/datetime.php

@@ -0,0 +1,101 @@
+<?php
+
+namespace Rhymix\Framework;
+
+/**
+ * The datetime class.
+ */
+class DateTime
+{
+	/**
+	 * Time zone objects and settings are cached here.
+	 */
+	protected static $_timezones = array();
+	
+	/**
+	 * Get the timezone to display for the current user.
+	 * 
+	 * @return string
+	 */
+	public static function getCurrentUserTimezone()
+	{
+		if (isset($_SESSION['timezone']))
+		{
+			return $_SESSION['timezone'];
+		}
+		else
+		{
+			return Config::get('locale.default_timezone');
+		}
+	}
+	
+	/**
+	 * Get the list of time zones supported on this server.
+	 * 
+	 * @return array
+	 */
+	public static function getTimezoneList()
+	{
+		$result = array();
+		$tzlist = \DateTimeZone::listIdentifiers();
+		foreach ($tzlist as $tzid)
+		{
+			if (!preg_match('/^(?:A|Europe|Indian|Pacific)/', $tzid)) continue;
+			$name = str_replace('_', ' ', $tzid);
+			$datetime = new \DateTime(null, new \DateTimeZone($tzid));
+			$offset = $datetime->getOffset();
+			$offset = ($offset >= 0 ? '+' : '-') . sprintf('%02d', floor(abs($offset) / 3600)) . ':' . sprintf('%02d', (abs($offset) % 3600) / 60);
+			unset($datetime);
+			$result[$tzid] = "$name ($offset)";
+		}
+		asort($result);
+		$result['Etc/UTC'] = 'GMT/UTC (+00:00)';
+		return $result;
+	}
+	
+	/**
+	 * Get the absolute (UTC) offset of a timezone.
+	 * 
+	 * @param string $timezone Timezone identifier, e.g. Asia/Seoul
+	 * @param int $timestamp Unix timestamp (optional, default is now)
+	 * @return int
+	 */
+	public static function getTimezoneOffset($timezone, $timestamp = null)
+	{
+		if (!isset(self::$_timezones[$timezone]))
+		{
+			self::$_timezones[$timezone] = new \DateTimeZone($timezone);
+		}
+		$datetime = new \DateTime();
+		$datetime->setTimestamp($timestamp ?: time());
+		$datetime->setTimezone(self::$_timezones[$timezone]);
+		return $datetime->getOffset();
+	}
+	
+	/**
+	 * Get the relative offset between a timezone and Rhymix's internal timezone.
+	 * 
+	 * @param string $timezone Timezone identifier, e.g. Asia/Seoul
+	 * @param int $timestamp Unix timestamp (optional, default is now)
+	 * @return int
+	 */
+	public static function getTimezoneOffsetFromInternal($timezone, $timestamp = null)
+	{
+		return self::getTimezoneOffset($timezone, $timestamp) - Config::get('locale.internal_timezone');
+	}
+	
+	/**
+	 * Get a PHP time zone by UTC offset.
+	 * 
+	 * @param int $offset
+	 * @return bool
+	 */
+	public static function getTimezoneNameByOffset($offset)
+	{
+		switch ($offset)
+		{
+			case 0: return 'Etc/UTC';
+			default: return 'Etc/GMT' . ($offset > 0 ? '-' : '+') . intval(abs($offset / 3600));
+		}
+	}
+}

modules/install/install.view.php

@@ -146,10 +146,7 @@ class installView extends install
 		}
 		
 		// Get list of time zones.
-		$timezones = DateTimeZone::listIdentifiers();
-		natcasesort($timezones);
-		$timezones = array_combine($timezones, $timezones);
-		Context::set('timezones', $timezones);
+		Context::set('timezones', Rhymix\Framework\DateTime::getTimezoneList());
 		
 		// Automatically select a time zone for the user.
 		Context::set('selected_timezone', $this->detectUserTimeZone());