diff --git a/ipywidgets/widgets/trait_types.py b/ipywidgets/widgets/trait_types.py
index b89ec13c93..f1a453457c 100644
--- a/ipywidgets/widgets/trait_types.py
+++ b/ipywidgets/widgets/trait_types.py
@@ -121,6 +121,54 @@ def datetime_from_json(js, manager):
 }
 
 
+def naive_to_json(pydt, manager):
+    """Serialize a naive Python datetime object to json.
+
+    Instantiating a JavaScript Date object with a string assumes that the
+    string is a UTC string, while instantiating it with constructor arguments
+    assumes that it's in local time:
+
+    >>> cdate = new Date('2015-05-12')
+    Mon May 11 2015 20:00:00 GMT-0400 (Eastern Daylight Time)
+    >>> cdate = new Date(2015, 4, 12) // Months are 0-based indices in JS
+    Tue May 12 2015 00:00:00 GMT-0400 (Eastern Daylight Time)
+
+    Attributes of this dictionary are to be passed to the JavaScript Date
+    constructor.
+    """
+    if pydt is None:
+        return None
+    else:
+        naivedt = pydt.replace(tzinfo=None)
+        return dict(
+            year=naivedt.year,
+            month=naivedt.month - 1,  # Months are 0-based indices in JS
+            date=naivedt.day,
+            hours=naivedt.hour,  # Hours, Minutes, Seconds and Milliseconds
+            minutes=naivedt.minute,  # are plural in JS
+            seconds=naivedt.second,
+            milliseconds=naivedt.microsecond / 1000,
+        )
+
+
+def naive_from_json(js, manager):
+    """Deserialize a naive Python datetime object from json."""
+    if js is None:
+        return None
+    else:
+        return dt.datetime(
+            js["year"],
+            js["month"] + 1,  # Months are 1-based in Python
+            js["date"],
+            js["hours"],
+            js["minutes"],
+            js["seconds"],
+            js["milliseconds"] * 1000,
+        )
+
+naive_serialization = {"from_json": naive_from_json, "to_json": naive_to_json}
+
+
 def date_to_json(pydate, manager):
     """Serialize a Python date object.
 
diff --git a/ipywidgets/widgets/widget_datetime.py b/ipywidgets/widgets/widget_datetime.py
index 12e450de73..0a1ccab6ac 100644
--- a/ipywidgets/widgets/widget_datetime.py
+++ b/ipywidgets/widgets/widget_datetime.py
@@ -10,7 +10,7 @@
 
 from traitlets import Unicode, Bool, validate, TraitError
 
-from .trait_types import datetime_serialization, Datetime
+from .trait_types import datetime_serialization, Datetime, naive_serialization
 from .valuewidget import ValueWidget
 from .widget import register
 from .widget_core import CoreWidget
@@ -20,7 +20,7 @@
 @register
 class DatetimePicker(DescriptionWidget, ValueWidget, CoreWidget):
     """
-    Display a widget for picking times.
+    Display a widget for picking datetimes.
 
     Parameters
     ----------
@@ -42,7 +42,7 @@ class DatetimePicker(DescriptionWidget, ValueWidget, CoreWidget):
 
     >>> import datetime
     >>> import ipydatetime
-    >>> datetime_pick = ipydatetime.TimePicker()
+    >>> datetime_pick = ipydatetime.DatetimePicker()
     >>> datetime_pick.value = datetime.datetime(2018, 09, 5, 12, 34, 3)
     """
 
@@ -55,10 +55,16 @@ class DatetimePicker(DescriptionWidget, ValueWidget, CoreWidget):
     min = Datetime(None, allow_none=True).tag(sync=True, **datetime_serialization)
     max = Datetime(None, allow_none=True).tag(sync=True, **datetime_serialization)
 
+    def _validate_tz(self, value):
+        if value.tzinfo is None:
+            raise TraitError('%s values needs to be timezone aware' % (self.__class__.__name__,))
+        return value
+
     @validate("value")
     def _validate_value(self, proposal):
         """Cap and floor value"""
         value = proposal["value"]
+        value = self._validate_tz(value)
         if self.min and self.min > value:
             value = max(value, self.min)
         if self.max and self.max < value:
@@ -69,6 +75,7 @@ def _validate_value(self, proposal):
     def _validate_min(self, proposal):
         """Enforce min <= value <= max"""
         min = proposal["value"]
+        min = self._validate_tz(min)
         if self.max and min > self.max:
             raise TraitError("Setting min > max")
         if self.value and min > self.value:
@@ -79,8 +86,53 @@ def _validate_min(self, proposal):
     def _validate_max(self, proposal):
         """Enforce min <= value <= max"""
         max = proposal["value"]
+        max = self._validate_tz(max)
         if self.min and max < self.min:
             raise TraitError("setting max < min")
         if self.value and max < self.value:
             self.value = max
         return max
+
+
+@register
+class NaiveDatetimePicker(DatetimePicker):
+    """
+    Display a widget for picking naive datetimes (i.e. timezone unaware).
+
+    Parameters
+    ----------
+
+    value: datetime.datetime
+        The current value of the widget.
+
+    disabled: bool
+        Whether to disable user changes.
+
+    min: datetime.datetime
+        The lower allowed datetime bound
+
+    max: datetime.datetime
+        The upper allowed datetime bound
+
+    Examples
+    --------
+
+    >>> import datetime
+    >>> import ipydatetime
+    >>> datetime_pick = ipydatetime.NaiveDatetimePicker()
+    >>> datetime_pick.value = datetime.datetime(2018, 09, 5, 12, 34, 3)
+    """
+
+    # Replace the serializers and model names:
+
+    _model_name = Unicode("NaiveDatetimeModel").tag(sync=True)
+
+    value = Datetime(None, allow_none=True).tag(sync=True, **naive_serialization)
+
+    min = Datetime(None, allow_none=True).tag(sync=True, **naive_serialization)
+    max = Datetime(None, allow_none=True).tag(sync=True, **naive_serialization)
+
+    def _validate_tz(self, value):
+        if value.tzinfo is not None:
+            raise TraitError('%s values needs to be timezone unaware' % (self.__class__.__name__,))
+        return value
diff --git a/packages/controls/src/widget_datetime.ts b/packages/controls/src/widget_datetime.ts
index a422c0d40a..9fc43f8aa2 100644
--- a/packages/controls/src/widget_datetime.ts
+++ b/packages/controls/src/widget_datetime.ts
@@ -305,3 +305,94 @@ namespace Private {
     return value ? dt_as_dt_string(value).split('T', 2)[1] : '';
   }
 }
+
+export interface ISerializedNaiveDatetime {
+  /**
+   * full year
+   */
+  year: number;
+
+  /**
+   * zero-based month (0 means January, 11 means December)
+   */
+  month: number;
+
+  /**
+   * day of month
+   */
+  date: number;
+
+  /**
+   * hour (24H format)
+   */
+  hours: number;
+
+  /**
+   * minutes
+   */
+  minutes: number;
+
+  /**
+   * seconds
+   */
+  seconds: number;
+
+  /**
+   * millisconds
+   */
+  milliseconds: number;
+}
+
+export function serialize_naive(
+  value: Date | null
+): ISerializedNaiveDatetime | null {
+  if (value === null) {
+    return null;
+  } else {
+    return {
+      year: value.getFullYear(),
+      month: value.getMonth(),
+      date: value.getDate(),
+      hours: value.getHours(),
+      minutes: value.getMinutes(),
+      seconds: value.getSeconds(),
+      milliseconds: value.getMilliseconds()
+    };
+  }
+}
+
+export function deserialize_naive(
+  value: ISerializedNaiveDatetime
+): Date | null {
+  if (value === null) {
+    return null;
+  } else {
+    const date = new Date();
+    date.setFullYear(value.year, value.month, value.date);
+    date.setHours(
+      value.hours,
+      value.minutes,
+      value.seconds,
+      value.milliseconds
+    );
+    return date;
+  }
+}
+
+export const naive_serializers = {
+  serialize: serialize_naive,
+  deserialize: deserialize_naive
+};
+
+export class NaiveDatetimeModel extends DatetimeModel {
+  defaults(): Backbone.ObjectHash {
+    return { ...super.defaults(), _model_name: 'NaiveDatetimeModel' };
+  }
+
+  static serializers: ISerializers = {
+    ...CoreDescriptionModel.serializers,
+    value: naive_serializers,
+    min: naive_serializers,
+    max: naive_serializers
+  };
+}
diff --git a/packages/controls/test/src/widget_datetime_test.ts b/packages/controls/test/src/widget_datetime_test.ts
index b3864cd050..607567889e 100644
--- a/packages/controls/test/src/widget_datetime_test.ts
+++ b/packages/controls/test/src/widget_datetime_test.ts
@@ -11,7 +11,7 @@ import {
   createTestModelFromSerialized
 } from './utils';
 
-import { DatetimeModel, DatetimeView } from '../../lib';
+import { DatetimeModel, DatetimeView, NaiveDatetimeModel } from '../../lib';
 
 describe('Datetime', () => {
   const date = new Date();
@@ -112,4 +112,89 @@ describe('Datetime', () => {
       expect(view.model).to.equal(model);
     });
   });
+
+  describe('NaiveDatetimeModel', () => {
+    it('should be createable', () => {
+      const model = createTestModel(NaiveDatetimeModel);
+      expect(model).to.be.an.instanceof(NaiveDatetimeModel);
+      expect(model.get('value')).to.be.a('null');
+    });
+
+    it('should be createable with a value', () => {
+      const state = { value: date };
+      const model = createTestModel(NaiveDatetimeModel, state);
+      expect(model).to.be.an.instanceof(NaiveDatetimeModel);
+      expect(model.get('value')).to.eql(date);
+    });
+
+    it('should serialize as expected', async () => {
+      const state_in = {
+        value: {
+          year: 2002,
+          month: 2,
+          date: 20,
+          hours: 20,
+          minutes: 2,
+          seconds: 20,
+          milliseconds: 2
+        }
+      };
+
+      const model = await createTestModelFromSerialized(
+        NaiveDatetimeModel,
+        state_in
+      );
+      model.widget_manager.register_model(
+        model.model_id,
+        Promise.resolve(model)
+      );
+
+      const state_out = await (model.widget_manager as DummyManager).get_state();
+      const models = Object.keys(state_out.state).map(
+        k => state_out.state[k].state
+      );
+      expect(models.length).to.eql(1);
+      expect(models[0]._model_name).to.be('NaiveDatetimeModel');
+      expect(models[0].value).to.eql(state_in.value);
+    });
+
+    it('should deserialize to Date object', async () => {
+      const state_in = {
+        value: {
+          year: 2002,
+          month: 2,
+          date: 20,
+          hours: 20,
+          minutes: 2,
+          seconds: 20,
+          milliseconds: 2
+        }
+      };
+
+      const model = await createTestModelFromSerialized(
+        NaiveDatetimeModel,
+        state_in
+      );
+      expect(model.get('value')).to.eql(new Date(2002, 2, 20, 20, 2, 20, 2));
+    });
+
+    it('should deserialize null', async () => {
+      const state_in = { value: null };
+
+      const model = await createTestModelFromSerialized(
+        NaiveDatetimeModel,
+        state_in
+      );
+      expect(model.get('value')).to.be.a('null');
+    });
+
+    it('should deserialize undefined', async () => {
+      const state_in = {};
+      const model = await createTestModelFromSerialized(
+        NaiveDatetimeModel,
+        state_in
+      );
+      expect(model.get('value')).to.be.a('null');
+    });
+  });
 });
diff --git a/packages/schema/jupyterwidgetmodels.latest.json b/packages/schema/jupyterwidgetmodels.latest.json
index 06eac0adba..62f705ad32 100644
--- a/packages/schema/jupyterwidgetmodels.latest.json
+++ b/packages/schema/jupyterwidgetmodels.latest.json
@@ -368,9 +368,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -426,10 +424,7 @@
       {
         "default": [],
         "help": "List of widget children",
-        "items": {
-          "type": "reference",
-          "widget": "Widget"
-        },
+        "items": { "type": "reference", "widget": "Widget" },
         "name": "children",
         "type": "array"
       },
@@ -478,9 +473,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -588,9 +581,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -655,18 +646,8 @@
         "type": "reference",
         "widget": "Layout"
       },
-      {
-        "default": 100.0,
-        "help": "Max value",
-        "name": "max",
-        "type": "float"
-      },
-      {
-        "default": 0.0,
-        "help": "Min value",
-        "name": "min",
-        "type": "float"
-      },
+      { "default": 100.0, "help": "Max value", "name": "max", "type": "float" },
+      { "default": 0.0, "help": "Min value", "name": "min", "type": "float" },
       {
         "allow_none": true,
         "default": null,
@@ -718,9 +699,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -785,18 +764,8 @@
         "type": "reference",
         "widget": "Layout"
       },
-      {
-        "default": 100,
-        "help": "Max value",
-        "name": "max",
-        "type": "int"
-      },
-      {
-        "default": 0,
-        "help": "Min value",
-        "name": "min",
-        "type": "int"
-      },
+      { "default": 100, "help": "Max value", "name": "max", "type": "int" },
+      { "default": 0, "help": "Min value", "name": "min", "type": "int" },
       {
         "default": 1,
         "help": "Minimum step to increment the value",
@@ -824,12 +793,7 @@
         "name": "tooltip",
         "type": "string"
       },
-      {
-        "default": 0,
-        "help": "Int value",
-        "name": "value",
-        "type": "int"
-      }
+      { "default": 0, "help": "Int value", "name": "value", "type": "int" }
     ],
     "model": {
       "module": "@jupyter-widgets/controls",
@@ -847,9 +811,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -899,10 +861,7 @@
       {
         "default": [],
         "help": "List of widget children",
-        "items": {
-          "type": "reference",
-          "widget": "Widget"
-        },
+        "items": { "type": "reference", "widget": "Widget" },
         "name": "children",
         "type": "array"
       },
@@ -944,9 +903,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -1119,9 +1076,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -1230,9 +1185,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -1341,9 +1294,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -1417,9 +1368,7 @@
       {
         "default": [],
         "help": "Dropdown options for the combobox",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "options",
         "type": "array"
       },
@@ -1473,9 +1422,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -1559,9 +1506,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -1651,9 +1596,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -1696,20 +1639,14 @@
       {
         "default": [],
         "help": "The axes on the gamepad.",
-        "items": {
-          "type": "reference",
-          "widget": "Axis"
-        },
+        "items": { "type": "reference", "widget": "Axis" },
         "name": "axes",
         "type": "array"
       },
       {
         "default": [],
         "help": "The buttons on the gamepad.",
-        "items": {
-          "type": "reference",
-          "widget": "Button"
-        },
+        "items": { "type": "reference", "widget": "Button" },
         "name": "buttons",
         "type": "array"
       },
@@ -1781,9 +1718,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -1868,9 +1803,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -1949,13 +1882,8 @@
         "name": "step",
         "type": ["int", "string"],
         "union_attributes": [
-          {
-            "type": "int"
-          },
-          {
-            "enum": ["any"],
-            "type": "string"
-          }
+          { "type": "int" },
+          { "enum": ["any"], "type": "string" }
         ]
       },
       {
@@ -2003,9 +1931,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -2242,9 +2168,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -2269,9 +2193,7 @@
       {
         "default": [],
         "help": "The labels for the options.",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_options_labels",
         "type": "array"
       },
@@ -2357,9 +2279,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -2493,9 +2413,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -2647,9 +2565,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -2710,18 +2626,8 @@
         "type": "reference",
         "widget": "Layout"
       },
-      {
-        "default": 100.0,
-        "help": "Max value",
-        "name": "max",
-        "type": "float"
-      },
-      {
-        "default": 0.0,
-        "help": "Min value",
-        "name": "min",
-        "type": "float"
-      },
+      { "default": 100.0, "help": "Max value", "name": "max", "type": "float" },
+      { "default": 0.0, "help": "Min value", "name": "min", "type": "float" },
       {
         "default": "horizontal",
         "enum": ["horizontal", "vertical"],
@@ -2773,9 +2679,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -2840,18 +2744,8 @@
         "type": "reference",
         "widget": "Layout"
       },
-      {
-        "default": 100.0,
-        "help": "Max value",
-        "name": "max",
-        "type": "float"
-      },
-      {
-        "default": 0.0,
-        "help": "Min value",
-        "name": "min",
-        "type": "float"
-      },
+      { "default": 100.0, "help": "Max value", "name": "max", "type": "float" },
+      { "default": 0.0, "help": "Min value", "name": "min", "type": "float" },
       {
         "default": "horizontal",
         "enum": ["horizontal", "vertical"],
@@ -2921,9 +2815,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -2988,18 +2880,8 @@
         "type": "reference",
         "widget": "Layout"
       },
-      {
-        "default": 100.0,
-        "help": "Max value",
-        "name": "max",
-        "type": "float"
-      },
-      {
-        "default": 0.0,
-        "help": "Min value",
-        "name": "min",
-        "type": "float"
-      },
+      { "default": 100.0, "help": "Max value", "name": "max", "type": "float" },
+      { "default": 0.0, "help": "Min value", "name": "min", "type": "float" },
       {
         "default": "horizontal",
         "enum": ["horizontal", "vertical"],
@@ -3069,9 +2951,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -3187,9 +3067,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -3239,10 +3117,7 @@
       {
         "default": [],
         "help": "List of widget children",
-        "items": {
-          "type": "reference",
-          "widget": "Widget"
-        },
+        "items": { "type": "reference", "widget": "Widget" },
         "name": "children",
         "type": "array"
       },
@@ -3284,9 +3159,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -3336,10 +3209,7 @@
       {
         "default": [],
         "help": "List of widget children",
-        "items": {
-          "type": "reference",
-          "widget": "Widget"
-        },
+        "items": { "type": "reference", "widget": "Widget" },
         "name": "children",
         "type": "array"
       },
@@ -3381,9 +3251,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -3486,9 +3354,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -3591,9 +3457,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -3695,9 +3559,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -3757,18 +3619,8 @@
         "type": "reference",
         "widget": "Layout"
       },
-      {
-        "default": 100,
-        "help": "Max value",
-        "name": "max",
-        "type": "int"
-      },
-      {
-        "default": 0,
-        "help": "Min value",
-        "name": "min",
-        "type": "int"
-      },
+      { "default": 100, "help": "Max value", "name": "max", "type": "int" },
+      { "default": 0, "help": "Min value", "name": "min", "type": "int" },
       {
         "default": "horizontal",
         "enum": ["horizontal", "vertical"],
@@ -3797,12 +3649,7 @@
         "name": "tooltip",
         "type": "string"
       },
-      {
-        "default": 0,
-        "help": "Int value",
-        "name": "value",
-        "type": "int"
-      }
+      { "default": 0, "help": "Int value", "name": "value", "type": "int" }
     ],
     "model": {
       "module": "@jupyter-widgets/controls",
@@ -3820,9 +3667,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -3887,18 +3732,8 @@
         "type": "reference",
         "widget": "Layout"
       },
-      {
-        "default": 100,
-        "help": "Max value",
-        "name": "max",
-        "type": "int"
-      },
-      {
-        "default": 0,
-        "help": "Min value",
-        "name": "min",
-        "type": "int"
-      },
+      { "default": 100, "help": "Max value", "name": "max", "type": "int" },
+      { "default": 0, "help": "Min value", "name": "min", "type": "int" },
       {
         "default": "horizontal",
         "enum": ["horizontal", "vertical"],
@@ -3968,9 +3803,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -4035,18 +3868,8 @@
         "type": "reference",
         "widget": "Layout"
       },
-      {
-        "default": 100,
-        "help": "Max value",
-        "name": "max",
-        "type": "int"
-      },
-      {
-        "default": 0,
-        "help": "Min value",
-        "name": "min",
-        "type": "int"
-      },
+      { "default": 100, "help": "Max value", "name": "max", "type": "int" },
+      { "default": 0, "help": "Min value", "name": "min", "type": "int" },
       {
         "default": "horizontal",
         "enum": ["horizontal", "vertical"],
@@ -4093,12 +3916,7 @@
         "name": "tooltip",
         "type": "string"
       },
-      {
-        "default": 0,
-        "help": "Int value",
-        "name": "value",
-        "type": "int"
-      }
+      { "default": 0, "help": "Int value", "name": "value", "type": "int" }
     ],
     "model": {
       "module": "@jupyter-widgets/controls",
@@ -4116,9 +3934,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -4210,12 +4026,7 @@
         "name": "tooltip",
         "type": "string"
       },
-      {
-        "default": 0,
-        "help": "Int value",
-        "name": "value",
-        "type": "int"
-      }
+      { "default": 0, "help": "Int value", "name": "value", "type": "int" }
     ],
     "model": {
       "module": "@jupyter-widgets/controls",
@@ -4233,9 +4044,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -4401,9 +4210,125 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
+        "name": "_dom_classes",
+        "type": "array"
+      },
+      {
+        "default": "@jupyter-widgets/controls",
+        "help": "",
+        "name": "_model_module",
+        "type": "string"
+      },
+      {
+        "default": "1.5.0",
+        "help": "",
+        "name": "_model_module_version",
+        "type": "string"
+      },
+      {
+        "default": "NaiveDatetimeModel",
+        "help": "",
+        "name": "_model_name",
+        "type": "string"
+      },
+      {
+        "default": "@jupyter-widgets/controls",
+        "help": "",
+        "name": "_view_module",
+        "type": "string"
+      },
+      {
+        "default": "1.5.0",
+        "help": "",
+        "name": "_view_module_version",
+        "type": "string"
+      },
+      {
+        "default": "DatetimeView",
+        "help": "",
+        "name": "_view_name",
+        "type": "string"
+      },
+      {
+        "default": "",
+        "help": "Description of the control.",
+        "name": "description",
+        "type": "string"
+      },
+      {
+        "default": false,
+        "help": "Enable or disable user changes.",
+        "name": "disabled",
+        "type": "bool"
+      },
+      {
+        "default": "reference to new instance",
+        "help": "",
+        "name": "layout",
+        "type": "reference",
+        "widget": "Layout"
+      },
+      {
+        "allow_none": true,
+        "default": null,
+        "help": "",
+        "name": "max",
+        "type": "Datetime"
+      },
+      {
+        "allow_none": true,
+        "default": null,
+        "help": "",
+        "name": "min",
+        "type": "Datetime"
+      },
+      {
+        "default": "reference to new instance",
+        "help": "Styling customizations",
+        "name": "style",
+        "type": "reference",
+        "widget": "DescriptionStyle"
+      },
+      {
+        "allow_none": true,
+        "default": null,
+        "help": "Is widget tabbable?",
+        "name": "tabbable",
+        "type": "bool"
+      },
+      {
+        "allow_none": true,
+        "default": null,
+        "help": "A tooltip caption.",
+        "name": "tooltip",
+        "type": "string"
+      },
+      {
+        "allow_none": true,
+        "default": null,
+        "help": "",
+        "name": "value",
+        "type": "Datetime"
+      }
+    ],
+    "model": {
+      "module": "@jupyter-widgets/controls",
+      "name": "NaiveDatetimeModel",
+      "version": "1.5.0"
+    },
+    "view": {
+      "module": "@jupyter-widgets/controls",
+      "name": "DatetimeView",
+      "version": "1.5.0"
+    }
+  },
+  {
+    "attributes": [
+      {
+        "default": [],
+        "help": "CSS classes applied to widget DOM element",
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -4518,9 +4443,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -4585,18 +4508,8 @@
         "type": "reference",
         "widget": "Layout"
       },
-      {
-        "default": 100,
-        "help": "Max value",
-        "name": "max",
-        "type": "int"
-      },
-      {
-        "default": 0,
-        "help": "Min value",
-        "name": "min",
-        "type": "int"
-      },
+      { "default": 100, "help": "Max value", "name": "max", "type": "int" },
+      { "default": 0, "help": "Min value", "name": "min", "type": "int" },
       {
         "default": false,
         "help": "Whether the control is currently playing.",
@@ -4615,12 +4528,7 @@
         "name": "show_repeat",
         "type": "bool"
       },
-      {
-        "default": 1,
-        "help": "Increment step",
-        "name": "step",
-        "type": "int"
-      },
+      { "default": 1, "help": "Increment step", "name": "step", "type": "int" },
       {
         "default": "reference to new instance",
         "help": "Styling customizations",
@@ -4642,12 +4550,7 @@
         "name": "tooltip",
         "type": "string"
       },
-      {
-        "default": 0,
-        "help": "Int value",
-        "name": "value",
-        "type": "int"
-      }
+      { "default": 0, "help": "Int value", "name": "value", "type": "int" }
     ],
     "model": {
       "module": "@jupyter-widgets/controls",
@@ -4728,9 +4631,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -4755,9 +4656,7 @@
       {
         "default": [],
         "help": "The labels for the options.",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_options_labels",
         "type": "array"
       },
@@ -4843,9 +4742,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -4870,9 +4767,7 @@
       {
         "default": [],
         "help": "The labels for the options.",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_options_labels",
         "type": "array"
       },
@@ -4964,9 +4859,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -4991,9 +4884,7 @@
       {
         "default": [],
         "help": "The labels for the options.",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_options_labels",
         "type": "array"
       },
@@ -5030,9 +4921,7 @@
       {
         "default": [],
         "help": "Selected indices",
-        "items": {
-          "type": "int"
-        },
+        "items": { "type": "int" },
         "name": "index",
         "type": "array"
       },
@@ -5087,9 +4976,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -5114,9 +5001,7 @@
       {
         "default": [],
         "help": "The labels for the options.",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_options_labels",
         "type": "array"
       },
@@ -5220,9 +5105,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -5247,9 +5130,7 @@
       {
         "default": [],
         "help": "The labels for the options.",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_options_labels",
         "type": "array"
       },
@@ -5416,9 +5297,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -5474,10 +5353,7 @@
       {
         "default": [],
         "help": "List of widget children",
-        "items": {
-          "type": "reference",
-          "widget": "Widget"
-        },
+        "items": { "type": "reference", "widget": "Widget" },
         "name": "children",
         "type": "array"
       },
@@ -5526,9 +5402,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -5584,10 +5458,7 @@
       {
         "default": [],
         "help": "List of widget children",
-        "items": {
-          "type": "reference",
-          "widget": "Widget"
-        },
+        "items": { "type": "reference", "widget": "Widget" },
         "name": "children",
         "type": "array"
       },
@@ -5636,9 +5507,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -5753,9 +5622,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -5877,9 +5744,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -5958,13 +5823,8 @@
         "name": "step",
         "type": ["float", "string"],
         "union_attributes": [
-          {
-            "type": "float"
-          },
-          {
-            "enum": ["any"],
-            "type": "string"
-          }
+          { "type": "float" },
+          { "enum": ["any"], "type": "string" }
         ]
       },
       {
@@ -6012,9 +5872,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -6130,9 +5988,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -6157,9 +6013,7 @@
       {
         "default": [],
         "help": "The labels for the options.",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_options_labels",
         "type": "array"
       },
@@ -6204,9 +6058,7 @@
       {
         "default": [],
         "help": "Icons names for each button (FontAwesome names without the fa- prefix).",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "icons",
         "type": "array"
       },
@@ -6248,9 +6100,7 @@
       {
         "default": [],
         "help": "Tooltips for each button.",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "tooltips",
         "type": "array"
       }
@@ -6339,9 +6189,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -6391,10 +6239,7 @@
       {
         "default": [],
         "help": "List of widget children",
-        "items": {
-          "type": "reference",
-          "widget": "Widget"
-        },
+        "items": { "type": "reference", "widget": "Widget" },
         "name": "children",
         "type": "array"
       },
@@ -6436,9 +6281,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -6547,9 +6390,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -6669,9 +6510,7 @@
       {
         "default": [],
         "help": "CSS classes applied to widget DOM element",
-        "items": {
-          "type": "string"
-        },
+        "items": { "type": "string" },
         "name": "_dom_classes",
         "type": "array"
       },
@@ -6727,9 +6566,7 @@
       {
         "default": [],
         "help": "The output messages synced from the frontend.",
-        "items": {
-          "type": "object"
-        },
+        "items": { "type": "object" },
         "name": "outputs",
         "type": "array"
       },
diff --git a/packages/schema/jupyterwidgetmodels.latest.md b/packages/schema/jupyterwidgetmodels.latest.md
index 5545306c1c..500210303a 100644
Binary files a/packages/schema/jupyterwidgetmodels.latest.md and b/packages/schema/jupyterwidgetmodels.latest.md differ