diff --git a/src/Bootstrap.php b/src/Bootstrap.php
index 71daaa4d..14e9360c 100644
--- a/src/Bootstrap.php
+++ b/src/Bootstrap.php
@@ -10,6 +10,7 @@ final class Bootstrap
 	public static function init($startTime)
 	{
 		self::$startTime = $startTime;
+		self::setTimezone();
 		self::turnErrorsIntoExceptions();
 		self::initAutoloader();
 	}
@@ -19,6 +20,11 @@ final class Bootstrap
 		return self::$startTime;
 	}
 
+	private static function setTimezone()
+	{
+		date_default_timezone_set('UTC');
+	}
+
 	private static function initAutoloader()
 	{
 		require(__DIR__