diff --git a/examples/reference/widgets/TimePicker.ipynb b/examples/reference/widgets/TimePicker.ipynb
index 4938842c8a..e8be1ad923 100644
--- a/examples/reference/widgets/TimePicker.ipynb
+++ b/examples/reference/widgets/TimePicker.ipynb
@@ -30,6 +30,12 @@
     "* **``start``** (str | datetime.time): Inclusive lower bound of the allowed time selection\n",
     "* **``end``** (str | datetime.time): Inclusive upper bound of the allowed time selection\n",
     "\n",
+    "##### Display\n",
+    "\n",
+    "* **``disabled``** (boolean): Whether the widget is editable\n",
+    "* **``name``** (str): The title of the widget\n",
+    "* **``format``** (str): Formatting specification for the display of the picked date.\n",
+    "\n",
     "    ```\n",
     "    +---+------------------------------------+------------+\n",
     "    | H | Hours (24 hours)                   | 00 to 23   |\n",
@@ -44,17 +50,11 @@
     "    See also https://flatpickr.js.org/formatting/#date-formatting-tokens.\n",
     "\n",
     "\n",
-    "\n",
-    "##### Display\n",
-    "\n",
-    "* **``disabled``** (boolean): Whether the widget is editable\n",
-    "* **``name``** (str): The title of the widget\n",
-    "* **``format``** (str): Formatting specification for the display of the picked date.\n",
     "* **``hour_increment``** (int): Defines the granularity of hour value increments in the UI. Default is 1.\n",
     "* **``minute_increment``** (int): Defines the granularity of minute value increments in the UI. Default is 1.\n",
     "* **``second_increment``** (int): Defines the granularity of second value increments in the UI. Default is 1.\n",
     "* **``seconds``** (bool): Allows to select seconds. By default, only hours and minutes are selectable, and AM/PM depending on the `clock` option. Default is False.\n",
-    "* **``clock``** (bool): Whether to use 12 hour or 24 hour clock.\n",
+    "* **``clock``** (str): Whether to use 12 hour or 24 hour clock. Default is `'12h'`.\n",
     "___"
    ]
   },
diff --git a/panel/widgets/input.py b/panel/widgets/input.py
index b088a3dfa9..bcf884579a 100644
--- a/panel/widgets/input.py
+++ b/panel/widgets/input.py
@@ -813,15 +813,15 @@ def _deserialize_value(self, value):
 
 class _TimeCommon(Widget):
 
-    hour_increment = param.Integer(default=1, doc="""
+    hour_increment = param.Integer(default=1, bounds=(1, None), doc="""
     Defines the granularity of hour value increments in the UI.
     """)
 
-    minute_increment = param.Integer(default=1, doc="""
+    minute_increment = param.Integer(default=1, bounds=(1, None), doc="""
     Defines the granularity of minute value increments in the UI.
     """)
 
-    second_increment = param.Integer(default=1, doc="""
+    second_increment = param.Integer(default=1, bounds=(1, None), doc="""
     Defines the granularity of second value increments in the UI.
     """)
 
@@ -830,7 +830,7 @@ class _TimeCommon(Widget):
     selectable, and AM/PM depending on the `clock` option.
     """)
 
-    clock = param.String(default='12h', doc="""
+    clock = param.Selector(default='12h', objects=['12h', '24h'], doc="""
         Whether to use 12 hour or 24 hour clock.""")
 
     __abstract = True