diff --git a/src/JsonSchema/Rfc3339.php b/src/JsonSchema/Rfc3339.php
index fb2eb7d5..88c96cd9 100644
--- a/src/JsonSchema/Rfc3339.php
+++ b/src/JsonSchema/Rfc3339.php
@@ -4,7 +4,7 @@
 
 class Rfc3339
 {
-    const REGEX = '/^(\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2})(\.\d+)?(Z|([+-]\d{2}):?(\d{2}))$/';
+    const REGEX = '/^(\d{4}-\d{2}-\d{2}[T ]{1}\d{2}:\d{2}:\d{2})(\.\d+)?(Z|([+-]\d{2}):?(\d{2}))$/';
 
     /**
      * Try creating a DateTime instance
@@ -23,7 +23,9 @@ public static function createFromString($string)
         $microseconds = $matches[2] ?: '.000000';
         $timeZone = 'Z' !== $matches[3] ? $matches[4] . ':' . $matches[5] : '+00:00';
 
-        $dateTime = \DateTime::createFromFormat('Y-m-d\TH:i:s.uP', $dateAndTime . $microseconds . $timeZone, new \DateTimeZone('UTC'));
+        $dateFormat = strpos($dateAndTime, 'T') === false ? 'Y-m-d H:i:s.uP' : 'Y-m-d\TH:i:s.uP';
+
+        $dateTime = \DateTime::createFromFormat($dateFormat, $dateAndTime . $microseconds . $timeZone, new \DateTimeZone('UTC'));
 
         return $dateTime ?: null;
     }