json/v1.0/estimate.json in sk_api_schema-0.3.0 vs json/v1.0/estimate.json in sk_api_schema-0.3.1

@@ -161,25 +161,29 @@
           "type":"string"
         },
         "filter[from]":{
           "title" : "From date",
           "description": "Objects with a date after the date",
-          "type" : "date"
+          "format" : "date",
+          "type" : "string"
         },
         "filter[to]":{
           "title" : "To date",
           "description": "Objects with date before the date",
-          "type" : "date"
+          "format" : "date",
+          "type" : "string"
         },
         "filter[created_at_from]":{
           "title" : "From date",
           "description": "Objects with a creation date after the date, including given datetime. ISO 8601 format YYY-MM-DDThh:mm:ss+z",
-          "type" : "date-time"
+          "format" : "date-time",
+          "type" : "string"
         },
         "filter[created_at_to]":{
           "title" : "To date",
           "description": "Objects with a creation date before the date, including given datetime. ISO 8601 format YYY-MM-DDThh:mm:ss+z",
-          "type" : "date-time"
+          "format" : "date-time",
+          "type" : "string"
         },
         "filter[languages]":{
           "title" : "Languages",
           "description": "A list of language codes, comma separated",
           "type" : "string"