diff --git a/CHANGELOG.md b/CHANGELOG.md
index 278c5c0f9..1ddcba8fc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Removed
 
 ### Fixed
+- Fixed several JSON Schemas
 - Fixed examples
 
 ## [v1.0.0-beta.1] - 2020-05-29
diff --git a/extensions/datacube/json-schema/schema.json b/extensions/datacube/json-schema/schema.json
index 89e875b35..ee64d4949 100644
--- a/extensions/datacube/json-schema/schema.json
+++ b/extensions/datacube/json-schema/schema.json
@@ -117,19 +117,19 @@
             ]
           },
           "description": {
-            "$ref": "#/definitions/fields/description"
+            "$ref": "#/definitions/description"
           },
           "extent": {
-            "$ref": "#/definitions/fields/extent_open"
+            "$ref": "#/definitions/extent_open"
           },
           "values": {
-            "$ref": "#/definitions/fields/values"
+            "$ref": "#/definitions/values"
           },
           "step": {
-            "$ref": "#/definitions/fields/step"
+            "$ref": "#/definitions/step"
           },
           "unit": {
-            "$ref": "#/definitions/fields/unit"
+            "$ref": "#/definitions/unit"
           },
           "reference_system": {
             "type": "string"
@@ -146,25 +146,25 @@
         ],
         "properties": {
           "type": {
-            "$ref": "#/definitions/fields/type_spatial"
+            "$ref": "#/definitions/type_spatial"
           },
           "axis": {
-            "$ref": "#/definitions/fields/axis_xy"
+            "$ref": "#/definitions/axis_xy"
           },
           "description": {
-            "$ref": "#/definitions/fields/description"
+            "$ref": "#/definitions/description"
           },
           "extent": {
-            "$ref": "#/definitions/fields/extent_closed"
+            "$ref": "#/definitions/extent_closed"
           },
           "values": {
-            "$ref": "#/definitions/fields/values_numeric"
+            "$ref": "#/definitions/values_numeric"
           },
           "step": {
-            "$ref": "#/definitions/fields/step"
+            "$ref": "#/definitions/step"
           },
           "reference_system": {
-            "$ref": "#/definitions/fields/reference_system_spatial"
+            "$ref": "#/definitions/reference_system_spatial"
           }
         }
       },
@@ -189,28 +189,28 @@
         ],
         "properties": {
           "type": {
-            "$ref": "#/definitions/fields/type_spatial"
+            "$ref": "#/definitions/type_spatial"
           },
           "axis": {
-            "$ref": "#/definitions/fields/axis_z"
+            "$ref": "#/definitions/axis_z"
           },
           "description": {
-            "$ref": "#/definitions/fields/description"
+            "$ref": "#/definitions/description"
           },
           "extent": {
-            "$ref": "#/definitions/fields/extent_open"
+            "$ref": "#/definitions/extent_open"
           },
           "values": {
-            "$ref": "#/definitions/fields/values"
+            "$ref": "#/definitions/values"
           },
           "step": {
-            "$ref": "#/definitions/fields/step"
+            "$ref": "#/definitions/step"
           },
           "unit": {
-            "$ref": "#/definitions/fields/unit"
+            "$ref": "#/definitions/unit"
           },
           "reference_system": {
-            "$ref": "#/definitions/fields/reference_system_spatial"
+            "$ref": "#/definitions/reference_system_spatial"
           }
         }
       },
@@ -230,7 +230,7 @@
             "const": "temporal"
           },
           "description": {
-            "$ref": "#/definitions/fields/description"
+            "$ref": "#/definitions/description"
           },
           "values": {
             "type": "array",
@@ -259,82 +259,80 @@
         }
       }
     },
-    "fields": {
-      "type_spatial": {
-        "type": "string",
-        "const": "spatial"
-      },
-      "axis_xy": {
-        "type": "string",
-        "enum": [
-          "x",
-          "y"
-        ]
-      },
-      "axis_z": {
-        "type": "string",
-        "const": "z"
-      },
-      "extent_closed": {
-        "type": "array",
-        "minItems": 2,
-        "maxItems": 2,
-        "items": {
-          "type": "number"
-        }
-      },
-      "extent_open": {
-        "type": "array",
-        "minItems": 2,
-        "maxItems": 2,
-        "items": {
-          "type": [
-            "number",
-            "null"
-          ]
-        }
-      },
-      "values_numeric": {
-        "type": "array",
-        "minItems": 1,
-        "items": {
-          "type": "number"
-        }
-      },
-      "values": {
-        "type": "array",
-        "minItems": 1,
-        "items": {
-          "oneOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "string"
-            }
-          ]
-        }
-      },
-      "step": {
+    "type_spatial": {
+      "type": "string",
+      "const": "spatial"
+    },
+    "axis_xy": {
+      "type": "string",
+      "enum": [
+        "x",
+        "y"
+      ]
+    },
+    "axis_z": {
+      "type": "string",
+      "const": "z"
+    },
+    "extent_closed": {
+      "type": "array",
+      "minItems": 2,
+      "maxItems": 2,
+      "items": {
+        "type": "number"
+      }
+    },
+    "extent_open": {
+      "type": "array",
+      "minItems": 2,
+      "maxItems": 2,
+      "items": {
         "type": [
           "number",
           "null"
         ]
-      },
-      "unit": {
-        "type": "string"
-      },
-      "reference_system_spatial": {
-        "type": [
-          "string",
-          "number",
-          "object"
-        ],
-        "default": 4326
-      },
-      "description": {
-        "type": "string"
       }
+    },
+    "values_numeric": {
+      "type": "array",
+      "minItems": 1,
+      "items": {
+        "type": "number"
+      }
+    },
+    "values": {
+      "type": "array",
+      "minItems": 1,
+      "items": {
+        "oneOf": [
+          {
+            "type": "number"
+          },
+          {
+            "type": "string"
+          }
+        ]
+      }
+    },
+    "step": {
+      "type": [
+        "number",
+        "null"
+      ]
+    },
+    "unit": {
+      "type": "string"
+    },
+    "reference_system_spatial": {
+      "type": [
+        "string",
+        "number",
+        "object"
+      ],
+      "default": 4326
+    },
+    "description": {
+      "type": "string"
     }
   }
 }
\ No newline at end of file
diff --git a/extensions/single-file-stac/json-schema/schema.json b/extensions/single-file-stac/json-schema/schema.json
index 7a247d28e..b4adaf0d7 100644
--- a/extensions/single-file-stac/json-schema/schema.json
+++ b/extensions/single-file-stac/json-schema/schema.json
@@ -5,7 +5,7 @@
   "description": "Single File STAC Extension to combine Collections and Items in single file catalog",
   "allOf": [
     {
-      "$ref": "../../catalog-spec/json-schema/catalog.json"
+      "$ref": "../../../catalog-spec/json-schema/catalog.json"
     },
     {
       "$ref": "https://geojson.org/schema/FeatureCollection.json"
@@ -31,13 +31,13 @@
         "collections": {
           "type": "array",
           "items": {
-            "$ref": "../../collection-spec/json-schema/collection.json"
+            "$ref": "../../../collection-spec/json-schema/collection.json"
           }
         },
         "features": {
           "type": "array",
           "items": {
-            "$ref": "../../item-spec/json-schema/item.json"
+            "$ref": "../../../item-spec/json-schema/item.json"
           }
         }
       }
diff --git a/item-spec/json-schema/datetime.json b/item-spec/json-schema/datetime.json
index fe8dd55ae..e87ae5385 100644
--- a/item-spec/json-schema/datetime.json
+++ b/item-spec/json-schema/datetime.json
@@ -1,6 +1,6 @@
 {
   "$schema": "http://json-schema.org/draft-07/schema#",
-  "$id": "schema.json#",
+  "$id": "datetime.json#",
   "title": "Date and Time Fields",
   "type": "object",
   "allOf": [
@@ -22,7 +22,7 @@
           ],
           "properties": {
             "datetime": {
-              "$ref": "#/definitions/datetime_string"
+              "$ref": "#/definitions/datetime"
             },
             "start_datetime": {
               "$ref": "#/definitions/start_datetime"
@@ -54,7 +54,7 @@
             "datetime": {
               "oneOf": [
                 {
-                  "$ref": "#/definitions/datetime_string"
+                  "$ref": "#/definitions/datetime"
                 },
                 {
                   "type": ["null"],
@@ -74,6 +74,24 @@
     }
   ],
   "definitions": {
+    "datetime": {
+      "title": "Date and Time",
+      "description": "The searchable date/time of the assets, in UTC (Formatted in RFC 3339) ",
+      "type": "string",
+      "format": "date-time"
+    },
+    "start_datetime": {
+      "title": "Start Date and Time",
+      "description": "The searchable start date/time of the assets, in UTC (Formatted in RFC 3339) ",
+      "type": "string",
+      "format": "date-time"
+    }, 
+    "end_datetime": {
+      "title": "End Date and Time", 
+      "description": "The searchable end date/time of the assets, in UTC (Formatted in RFC 3339) ",                  
+      "type": "string",
+      "format": "date-time"
+    },
     "created": {
       "title": "Creation Time",
       "type": "string",
diff --git a/item-spec/json-schema/instrument.json b/item-spec/json-schema/instrument.json
index a42f22a28..9a9f508ff 100644
--- a/item-spec/json-schema/instrument.json
+++ b/item-spec/json-schema/instrument.json
@@ -26,6 +26,6 @@
     "gsd": {
       "title": "Ground Sample Distance",
       "type": "number"
-    },
+    }
   }
 }
\ No newline at end of file
diff --git a/item-spec/json-schema/item.json b/item-spec/json-schema/item.json
index 952e974aa..f3e1bab61 100644
--- a/item-spec/json-schema/item.json
+++ b/item-spec/json-schema/item.json
@@ -4,7 +4,6 @@
   "title": "STAC Item",
   "type": "object",
   "description": "This object represents the metadata for an item in a SpatioTemporal Asset Catalog.",
-  "additionalProperties": true,
   "allOf": [
     {
       "$ref": "#/definitions/core"