Merge branch 'ticket/bantu/7729' into prep-release-3.0.9

* ticket/bantu/7729:
  [ticket/7729] Prevent date/time functions from throwing E_WARNING on PHP 5.3.

phpBB/includes/startup.php

@@ -118,5 +118,33 @@ else
 	define('STRIP', (get_magic_quotes_gpc()) ? true : false);
 }
 
+// Prevent date/time functions from throwing E_WARNING on PHP 5.3 by setting a default timezone
+if (function_exists('date_default_timezone_set') && function_exists('date_default_timezone_get'))
+{
+	// For PHP 5.1.0 the date/time functions have been rewritten
+	// and setting a timezone is required prior to calling any date/time function.
+
+	// Since PHP 5.2.0 calls to date/time functions without having a timezone set
+	// result in E_STRICT errors being thrown.
+	// Note: We already exclude E_STRICT errors
+	// (to be exact: they are not included in E_ALL in PHP 5.2)
+
+	// In PHP 5.3.0 the error level has been raised to E_WARNING which causes problems
+	// because we show E_WARNING errors and do not set a default timezone.
+	// This is because we have our own timezone handling and work in UTC only anyway.
+
+	// So what we basically want to do is set our timezone to UTC,
+	// but we don't know what other scripts (such as bridges) are involved,
+	// so we check whether a timezone is already set by calling date_default_timezone_get().
+
+	// Unfortunately, date_default_timezone_get() itself might throw E_WARNING
+	// if no timezone has been set, so we have to keep it quiet with @.
+
+	// date_default_timezone_get() tries to guess the correct timezone first
+	// and then falls back to UTC when everything fails.
+	// We just set the timezone to whatever date_default_timezone_get() returns.
+	date_default_timezone_set(@date_default_timezone_get());
+}
+
 $starttime = explode(' ', microtime());
 $starttime = $starttime[1] + $starttime[0];