diff --git a/src/CenturyView/__tests__/Decade.jsx b/src/CenturyView/__tests__/Decade.jsx
index c070e91a..61f5aaa0 100644
--- a/src/CenturyView/__tests__/Decade.jsx
+++ b/src/CenturyView/__tests__/Decade.jsx
@@ -6,6 +6,7 @@ import Decade from '../Decade';
 /* eslint-disable comma-dangle, jsx-a11y/mouse-events-have-key-events */
 
 const tileProps = {
+  activeStartDate: new Date(2018, 0, 1),
   classes: ['react-calendar__tile'],
   date: new Date(2011, 0, 1),
   point: 2011,
diff --git a/src/DecadeView/__tests__/Year.jsx b/src/DecadeView/__tests__/Year.jsx
index f9956941..e7a78318 100644
--- a/src/DecadeView/__tests__/Year.jsx
+++ b/src/DecadeView/__tests__/Year.jsx
@@ -6,6 +6,7 @@ import Year from '../Year';
 /* eslint-disable comma-dangle, jsx-a11y/mouse-events-have-key-events */
 
 const tileProps = {
+  activeStartDate: new Date(2018, 0, 1),
   classes: ['react-calendar__tile'],
   date: new Date(2018, 0, 1),
   point: 2018,
diff --git a/src/MonthView/__tests__/Day.jsx b/src/MonthView/__tests__/Day.jsx
index dcaddf05..85b5a822 100644
--- a/src/MonthView/__tests__/Day.jsx
+++ b/src/MonthView/__tests__/Day.jsx
@@ -6,6 +6,7 @@ import Day from '../Day';
 /* eslint-disable comma-dangle, jsx-a11y/mouse-events-have-key-events */
 
 const tileProps = {
+  activeStartDate: new Date(2018, 0, 1),
   classes: ['react-calendar__tile'],
   currentMonthIndex: 0,
   date: new Date(2018, 0, 1),
diff --git a/src/YearView/__tests__/Month.jsx b/src/YearView/__tests__/Month.jsx
index 1d791792..e0a4aaf1 100644
--- a/src/YearView/__tests__/Month.jsx
+++ b/src/YearView/__tests__/Month.jsx
@@ -6,6 +6,7 @@ import Month from '../Month';
 /* eslint-disable comma-dangle, jsx-a11y/mouse-events-have-key-events */
 
 const tileProps = {
+  activeStartDate: new Date(2018, 0, 1),
   classes: ['react-calendar__tile'],
   date: new Date(2018, 0, 1),
 };
diff --git a/src/shared/dates.js b/src/shared/dates.js
index 4391b23d..ee657649 100644
--- a/src/shared/dates.js
+++ b/src/shared/dates.js
@@ -440,6 +440,18 @@ export const getRange = (rangeType, date) => {
  */
 export const getValueRange = (rangeType, date1, date2) => {
   const rawNextValue = [date1, date2].sort((a, b) => a.getTime() > b.getTime());
+  console.log(
+    'Original sorted values',
+    rawNextValue,
+    'their values',
+    rawNextValue.map(e => e.getTime()),
+    'their sorted values',
+    rawNextValue.map(e => e.getTime()).sort(),
+    'their mapped sorted values',
+    rawNextValue.map(e => e.getTime()).sort().map(e => new Date(e)),
+    'js sanity check',
+    [new Date(2018, 6, 1), new Date(2018, 0, 1)].sort((a, b) => a.getTime() > b.getTime()),
+  );
   return [
     getBegin(rangeType, rawNextValue[0]),
     getEnd(rangeType, rawNextValue[1]),