Use start date, if one is supplied, for initial_visible_month.

src/utils/convertToMoment.js

@@ -11,7 +11,13 @@ export default (newProps, momentProps) => {
             dest[key] = null;
 
             if (key === 'initial_visible_month') {
-                dest[key] = moment();
+                dest[key] = moment(
+                    newProps.start_date ||
+                        newProps.min_date_allowed ||
+                        newProps.end_date ||
+                        newProps.max_date_allowed ||
+                        undefined
+                );
             }
         } else {
             dest[key] = moment(value);

tests/integration/calendar/test_date_picker_range.py

@@ -0,0 +1,76 @@
+from datetime import datetime
+
+import dash
+import dash_html_components as html
+import dash_core_components as dcc
+
+
+def test_dtpr001_initial_month_provided(dash_dcc):
+    app = dash.Dash(__name__)
+    app.layout = html.Div([
+        dcc.DatePickerRange(
+            id="dps-initial-month",
+            min_date_allowed=datetime(2010, 1, 1),
+            max_date_allowed=datetime(2099, 12, 31),
+            initial_visible_month=datetime(2019, 10, 28)
+        )
+    ])
+
+    dash_dcc.start_server(app)
+
+    date_picker_start = dash_dcc.find_element(
+        '#dps-initial-month .DateInput_input.DateInput_input_1[placeholder="Start Date"]'
+    )
+    date_picker_start.click()
+
+    dash_dcc.wait_for_text_to_equal(
+        '#dps-initial-month .CalendarMonth.CalendarMonth_1[data-visible=true] strong',
+        'October 2019',
+        1
+    )
+
+
+def test_dtpr002_no_initial_month_min_date(dash_dcc):
+    app = dash.Dash(__name__)
+    app.layout = html.Div([
+        dcc.DatePickerRange(
+            id="dps-initial-month",
+            min_date_allowed=datetime(2010, 1, 1),
+            max_date_allowed=datetime(2099, 12, 31)
+        )
+    ])
+
+    dash_dcc.start_server(app)
+
+    date_picker_start = dash_dcc.find_element(
+        '#dps-initial-month .DateInput_input.DateInput_input_1[placeholder="Start Date"]'
+    )
+    date_picker_start.click()
+
+    dash_dcc.wait_for_text_to_equal(
+        '#dps-initial-month .CalendarMonth.CalendarMonth_1[data-visible=true] strong',
+        'January 2010'
+    )
+
+
+def test_dtpr003_no_initial_month_no_min_date_start_date(dash_dcc):
+    app = dash.Dash(__name__)
+    app.layout = html.Div([
+        dcc.DatePickerRange(
+            id="dps-initial-month",
+            start_date=datetime(2019, 8, 13),
+            max_date_allowed=datetime(2099, 12, 31)
+        )
+    ])
+
+    dash_dcc.start_server(app)
+
+    date_picker_start = dash_dcc.find_element(
+        '#dps-initial-month .DateInput_input.DateInput_input_1[placeholder="Start Date"]'
+    )
+    date_picker_start.click()
+
+    dash_dcc.wait_for_text_to_equal(
+        '#dps-initial-month .CalendarMonth.CalendarMonth_1[data-visible=true] strong',
+        'August 2019'
+    )

tests/integration/calendar/test_date_picker_single.py

@@ -125,3 +125,23 @@ def cb(clicks):
     )
     switched = dash_dcc.find_element("#dps-none input").get_attribute("value")
     assert switched != amnesiaed and switched == ""
+
+
+def test_dtps012_initial_month(dash_dcc):
+    app = dash.Dash(__name__)
+    app.layout = html.Div([
+        dcc.DatePickerSingle(
+            id="dps-initial-month",
+            min_date_allowed=datetime(2010, 1, 1),
+            max_date_allowed=datetime(2099, 12, 31)
+        )
+    ])
+
+    dash_dcc.start_server(app)
+
+    date_picker = dash_dcc.find_element('#dps-initial-month')
+    date_picker.click()
+    dash_dcc.wait_for_text_to_equal(
+        '#dps-initial-month .CalendarMonth.CalendarMonth_1[data-visible=true] strong',
+        'January 2010'
+    )