Add full timezone date example, fixes #3038

res/composer-schema.json

@@ -39,7 +39,7 @@
         },
         "time": {
             "type": "string",
-            "description": "Package release date, in 'YYYY-MM-DD' or 'YYYY-MM-DD HH:MM:SS' format."
+            "description": "Package release date, in 'YYYY-MM-DD', 'YYYY-MM-DD HH:MM:SS' or 'YYYY-MM-DDTHH:MM:SSZ' format."
         },
         "license": {
             "type": ["string", "array"],