diff --git a/__tests__/datePicker.darkMode.test.js b/__tests__/datePicker.darkMode.test.js
index f7e23cd..0942e2b 100644
--- a/__tests__/datePicker.darkMode.test.js
+++ b/__tests__/datePicker.darkMode.test.js
@@ -1,4 +1,4 @@
-import DatePicker from "../src/datePicker";
+import DatePicker from '../src/datePicker';
 
 describe('Dark/light mode UI', () => {
   let datePicker;
@@ -12,7 +12,7 @@ describe('Dark/light mode UI', () => {
     datePicker = new DatePicker(containerId, {
       mode: 'single',
       onSelect: jest.fn(),
-      darkMode: true
+      darkMode: true,
     });
     datePicker.init();
 
@@ -24,7 +24,7 @@ describe('Dark/light mode UI', () => {
     datePicker = new DatePicker(containerId, {
       mode: 'single',
       onSelect: jest.fn(),
-      darkMode: false
+      darkMode: false,
     });
     datePicker.init();
 
diff --git a/__tests__/datePicker.interactions.test.js b/__tests__/datePicker.interactions.test.js
index da56877..1bcb349 100644
--- a/__tests__/datePicker.interactions.test.js
+++ b/__tests__/datePicker.interactions.test.js
@@ -1,5 +1,5 @@
-import DatePicker from '../src/datePicker'
-import { getMonthName } from '../src/utils'
+import DatePicker from '../src/datePicker';
+import { getMonthName } from '../src/utils';
 
 describe('Interactions and basic functionality', () => {
   let datePicker;
@@ -11,7 +11,8 @@ describe('Interactions and basic functionality', () => {
       mode: 'single',
       onSelect: jest.fn(),
       blockedDays: [0, 6], // Sundays and Saturdays
-      showDayNames: true
+      showDayNames: true,
+      selectPastDatesEnabled: true,
     });
     datePicker.init();
   });
@@ -81,7 +82,7 @@ describe('Interactions and basic functionality', () => {
     datePicker.selectedEndDate = new Date(2023, 5, 15);
     const newStartDate = new Date(2023, 5, 20);
     datePicker.handleDayClick(newStartDate.getDate(), newStartDate.getMonth());
-    expect(datePicker.selectedStartDate).toEqual(newStartDate);
+    expect(datePicker.selectedStartDate.toString()).toMatch(newStartDate.toString());
     expect(datePicker.selectedEndDate).toBeNull();
   });
-});
\ No newline at end of file
+});
diff --git a/__tests__/datePicker.leapYear.test.js b/__tests__/datePicker.leapYear.test.js
index 9ae9727..3ef8e03 100644
--- a/__tests__/datePicker.leapYear.test.js
+++ b/__tests__/datePicker.leapYear.test.js
@@ -1,4 +1,4 @@
-import DatePicker from '../src/datePicker'
+import DatePicker from '../src/datePicker';
 
 describe('Leap year handling', () => {
   let datePicker;
@@ -10,7 +10,7 @@ describe('Leap year handling', () => {
       mode: 'single',
       onSelect: jest.fn(),
       blockedDays: [0, 6], // Sundays and Saturdays
-      showDayNames: true
+      showDayNames: true,
     });
     datePicker.init();
   });
@@ -28,4 +28,4 @@ describe('Leap year handling', () => {
     const days = datePicker.element.querySelectorAll('.datepicker-day.current-month');
     expect(days.length).toBe(29);
   });
-});
\ No newline at end of file
+});
diff --git a/__tests__/datePicker.localization.test.js b/__tests__/datePicker.localization.test.js
index 43e1ce6..f2cc82e 100644
--- a/__tests__/datePicker.localization.test.js
+++ b/__tests__/datePicker.localization.test.js
@@ -1,4 +1,4 @@
-import DatePicker from "../src/datePicker";
+import DatePicker from '../src/datePicker';
 
 jest.useFakeTimers();
 
@@ -6,14 +6,13 @@ const containerId = 'test-container';
 let datePicker;
 
 describe('Localization', () => {
-
   beforeEach(() => {
     document.body.innerHTML = `<div id="${containerId}"></div>`;
     datePicker = new DatePicker(containerId, {
       mode: 'single',
       onSelect: jest.fn(),
       blockedDays: [0, 6], // Sundays and Saturdays
-      showDayNames: true
+      showDayNames: true,
     });
     datePicker.init();
   });
@@ -185,7 +184,6 @@ describe('Localization', () => {
   });
 });
 
-
 describe('Localization for Bulgarian (bg-BG)', () => {
   let datePicker;
 
@@ -195,7 +193,7 @@ describe('Localization for Bulgarian (bg-BG)', () => {
       mode: 'single',
       onSelect: jest.fn(),
       blockedDays: [0, 6], // Sundays and Saturdays
-      showDayNames: true
+      showDayNames: true,
     });
     datePicker.init();
   });
@@ -220,14 +218,13 @@ describe('Localization for Bulgarian (bg-BG)', () => {
 describe('Localization for Czech (cs)', () => {
   let datePicker;
 
-
   beforeEach(() => {
     document.body.innerHTML = `<div id="${containerId}"></div>`;
     datePicker = new DatePicker(containerId, {
       mode: 'single',
       onSelect: jest.fn(),
       blockedDays: [0, 6], // Sundays and Saturdays
-      showDayNames: true
+      showDayNames: true,
     });
     datePicker.init();
   });
@@ -252,14 +249,13 @@ describe('Localization for Czech (cs)', () => {
 describe('Localization for Danish (da)', () => {
   let datePicker;
 
-
   beforeEach(() => {
     document.body.innerHTML = `<div id="${containerId}"></div>`;
     datePicker = new DatePicker(containerId, {
       mode: 'single',
       onSelect: jest.fn(),
       blockedDays: [0, 6], // Sundays and Saturdays
-      showDayNames: true
+      showDayNames: true,
     });
     datePicker.init();
   });
@@ -284,14 +280,13 @@ describe('Localization for Danish (da)', () => {
 describe('Localization for Greek (el)', () => {
   let datePicker;
 
-
   beforeEach(() => {
     document.body.innerHTML = `<div id="${containerId}"></div>`;
     datePicker = new DatePicker(containerId, {
       mode: 'single',
       onSelect: jest.fn(),
       blockedDays: [0, 6], // Sundays and Saturdays
-      showDayNames: true
+      showDayNames: true,
     });
     datePicker.init();
   });
@@ -313,18 +308,16 @@ describe('Localization for Greek (el)', () => {
   });
 });
 
-
 describe('Localization for Finnish (fi)', () => {
   let datePicker;
 
-
   beforeEach(() => {
     document.body.innerHTML = `<div id="${containerId}"></div>`;
     datePicker = new DatePicker(containerId, {
       mode: 'single',
       onSelect: jest.fn(),
       blockedDays: [0, 6], // Sundays and Saturdays
-      showDayNames: true
+      showDayNames: true,
     });
     datePicker.init();
   });
@@ -346,18 +339,16 @@ describe('Localization for Finnish (fi)', () => {
   });
 });
 
-
 describe('Localization for Croatian (hr-HR)', () => {
   let datePicker;
 
-
   beforeEach(() => {
     document.body.innerHTML = `<div id="${containerId}"></div>`;
     datePicker = new DatePicker(containerId, {
       mode: 'single',
       onSelect: jest.fn(),
       blockedDays: [0, 6], // Sundays and Saturdays
-      showDayNames: true
+      showDayNames: true,
     });
     datePicker.init();
   });
@@ -379,18 +370,16 @@ describe('Localization for Croatian (hr-HR)', () => {
   });
 });
 
-
 describe('Localization for Hungarian (hu)', () => {
   let datePicker;
 
-
   beforeEach(() => {
     document.body.innerHTML = `<div id="${containerId}"></div>`;
     datePicker = new DatePicker(containerId, {
       mode: 'single',
       onSelect: jest.fn(),
       blockedDays: [0, 6], // Sundays and Saturdays
-      showDayNames: true
+      showDayNames: true,
     });
     datePicker.init();
   });
@@ -412,18 +401,16 @@ describe('Localization for Hungarian (hu)', () => {
   });
 });
 
-
 describe('Localization for Indonesian (id)', () => {
   let datePicker;
 
-
   beforeEach(() => {
     document.body.innerHTML = `<div id="${containerId}"></div>`;
     datePicker = new DatePicker(containerId, {
       mode: 'single',
       onSelect: jest.fn(),
       blockedDays: [0, 6], // Sundays and Saturdays
-      showDayNames: true
+      showDayNames: true,
     });
     datePicker.init();
   });
@@ -445,18 +432,16 @@ describe('Localization for Indonesian (id)', () => {
   });
 });
 
-
 describe('Localization for Korean (ko)', () => {
   let datePicker;
 
-
   beforeEach(() => {
     document.body.innerHTML = `<div id="${containerId}"></div>`;
     datePicker = new DatePicker(containerId, {
       mode: 'single',
       onSelect: jest.fn(),
       blockedDays: [0, 6], // Sundays and Saturdays
-      showDayNames: true
+      showDayNames: true,
     });
     datePicker.init();
   });
@@ -478,18 +463,16 @@ describe('Localization for Korean (ko)', () => {
   });
 });
 
-
 describe('Localization for Lithuanian (lt-LT)', () => {
   let datePicker;
 
-
   beforeEach(() => {
     document.body.innerHTML = `<div id="${containerId}"></div>`;
     datePicker = new DatePicker(containerId, {
       mode: 'single',
       onSelect: jest.fn(),
       blockedDays: [0, 6], // Sundays and Saturdays
-      showDayNames: true
+      showDayNames: true,
     });
     datePicker.init();
   });
@@ -511,18 +494,16 @@ describe('Localization for Lithuanian (lt-LT)', () => {
   });
 });
 
-
 describe('Localization for Norwegian Bokmål (nb)', () => {
   let datePicker;
 
-
   beforeEach(() => {
     document.body.innerHTML = `<div id="${containerId}"></div>`;
     datePicker = new DatePicker(containerId, {
       mode: 'single',
       onSelect: jest.fn(),
       blockedDays: [0, 6], // Sundays and Saturdays
-      showDayNames: true
+      showDayNames: true,
     });
     datePicker.init();
   });
@@ -544,18 +525,16 @@ describe('Localization for Norwegian Bokmål (nb)', () => {
   });
 });
 
-
 describe('Localization for Polish (pl)', () => {
   let datePicker;
 
-
   beforeEach(() => {
     document.body.innerHTML = `<div id="${containerId}"></div>`;
     datePicker = new DatePicker(containerId, {
       mode: 'single',
       onSelect: jest.fn(),
       blockedDays: [0, 6], // Sundays and Saturdays
-      showDayNames: true
+      showDayNames: true,
     });
     datePicker.init();
   });
@@ -580,14 +559,13 @@ describe('Localization for Polish (pl)', () => {
 describe('Localization for Brazilian Portuguese (pt-BR)', () => {
   let datePicker;
 
-
   beforeEach(() => {
     document.body.innerHTML = `<div id="${containerId}"></div>`;
     datePicker = new DatePicker(containerId, {
       mode: 'single',
       onSelect: jest.fn(),
       blockedDays: [0, 6], // Sundays and Saturdays
-      showDayNames: true
+      showDayNames: true,
     });
     datePicker.init();
   });
@@ -612,14 +590,13 @@ describe('Localization for Brazilian Portuguese (pt-BR)', () => {
 describe('Localization for European Portuguese (pt-PT)', () => {
   let datePicker;
 
-
   beforeEach(() => {
     document.body.innerHTML = `<div id="${containerId}"></div>`;
     datePicker = new DatePicker(containerId, {
       mode: 'single',
       onSelect: jest.fn(),
       blockedDays: [0, 6], // Sundays and Saturdays
-      showDayNames: true
+      showDayNames: true,
     });
     datePicker.init();
   });
@@ -644,14 +621,13 @@ describe('Localization for European Portuguese (pt-PT)', () => {
 describe('Localization for Romanian (ro-RO)', () => {
   let datePicker;
 
-
   beforeEach(() => {
     document.body.innerHTML = `<div id="${containerId}"></div>`;
     datePicker = new DatePicker(containerId, {
       mode: 'single',
       onSelect: jest.fn(),
       blockedDays: [0, 6], // Sundays and Saturdays
-      showDayNames: true
+      showDayNames: true,
     });
     datePicker.init();
   });
@@ -676,7 +652,6 @@ describe('Localization for Romanian (ro-RO)', () => {
 describe('Localization for Slovak (sk-SK)', () => {
   let datePicker;
 
-
   beforeEach(() => {
     document.body.innerHTML = `<div id="${containerId}"></div>`;
 
@@ -684,7 +659,7 @@ describe('Localization for Slovak (sk-SK)', () => {
       mode: 'single',
       onSelect: jest.fn(),
       blockedDays: [0, 6],
-      showDayNames: true
+      showDayNames: true,
     });
     datePicker.init();
   });
@@ -710,14 +685,13 @@ describe('Localization for Slovak (sk-SK)', () => {
 describe('Localization for Slovenian (sl-SL)', () => {
   let datePicker;
 
-
   beforeEach(() => {
     document.body.innerHTML = `<div id="${containerId}"></div>`;
     datePicker = new DatePicker(containerId, {
       mode: 'single',
       onSelect: jest.fn(),
       blockedDays: [0, 6], // Sundays and Saturdays
-      showDayNames: true
+      showDayNames: true,
     });
     datePicker.init();
   });
@@ -742,14 +716,13 @@ describe('Localization for Slovenian (sl-SL)', () => {
 describe('Localization for Swedish (sv)', () => {
   let datePicker;
 
-
   beforeEach(() => {
     document.body.innerHTML = `<div id="${containerId}"></div>`;
     datePicker = new DatePicker(containerId, {
       mode: 'single',
       onSelect: jest.fn(),
       blockedDays: [0, 6], // Sundays and Saturdays
-      showDayNames: true
+      showDayNames: true,
     });
     datePicker.init();
   });
@@ -774,14 +747,13 @@ describe('Localization for Swedish (sv)', () => {
 describe('Localization for Thai (th)', () => {
   let datePicker;
 
-
   beforeEach(() => {
     document.body.innerHTML = `<div id="${containerId}"></div>`;
     datePicker = new DatePicker(containerId, {
       mode: 'single',
       onSelect: jest.fn(),
       blockedDays: [0, 6], // Sundays and Saturdays
-      showDayNames: true
+      showDayNames: true,
     });
     datePicker.init();
   });
@@ -806,14 +778,13 @@ describe('Localization for Thai (th)', () => {
 describe('Localization for Turkish (tr)', () => {
   let datePicker;
 
-
   beforeEach(() => {
     document.body.innerHTML = `<div id="${containerId}"></div>`;
     datePicker = new DatePicker(containerId, {
       mode: 'single',
       onSelect: jest.fn(),
       blockedDays: [0, 6], // Sundays and Saturdays
-      showDayNames: true
+      showDayNames: true,
     });
     datePicker.init();
   });
@@ -835,18 +806,16 @@ describe('Localization for Turkish (tr)', () => {
   });
 });
 
-
 describe('Localization for Vietnamese (vi)', () => {
   let datePicker;
 
-
   beforeEach(() => {
     document.body.innerHTML = `<div id="${containerId}"></div>`;
     datePicker = new DatePicker(containerId, {
       mode: 'single',
       onSelect: jest.fn(),
       blockedDays: [0, 6], // Sundays and Saturdays
-      showDayNames: true
+      showDayNames: true,
     });
     datePicker.init();
   });
@@ -868,16 +837,14 @@ describe('Localization for Vietnamese (vi)', () => {
   });
 });
 
-
 describe('Localization with Page Language', () => {
   let datePicker;
 
-
   beforeEach(() => {
     document.body.innerHTML = `<div id="${containerId}"></div>`;
   });
 
-  const setHtmlLangAttribute = (lang) => {
+  const setHtmlLangAttribute = lang => {
     document.documentElement.lang = lang;
   };
 
@@ -887,7 +854,7 @@ describe('Localization with Page Language', () => {
       datePicker = new DatePicker(containerId, {
         mode: 'single',
         onSelect: jest.fn(),
-        usePageLanguage: true
+        usePageLanguage: true,
       });
       datePicker.init();
       datePicker.currentDate = new Date(2023, 0, 1); // January 1, 2023
@@ -901,7 +868,6 @@ describe('Localization with Page Language', () => {
     });
   };
 
-
   testPageLanguageSetting('en', 'Sun', 'January 2023');
   testPageLanguageSetting('fr', 'Dim', 'Janvier 2023');
   testPageLanguageSetting('es', 'Dom', 'Enero 2023');
@@ -935,9 +901,7 @@ describe('Localization with Page Language', () => {
   testPageLanguageSetting('tr', 'Paz', 'Ocak 2023');
   testPageLanguageSetting('vi', 'CN', 'Tháng Một 2023');
 
-
   afterEach(() => {
     setHtmlLangAttribute('en');
   });
 });
-
diff --git a/__tests__/datePicker.test.js b/__tests__/datePicker.test.js
index f240024..f05ea0a 100644
--- a/__tests__/datePicker.test.js
+++ b/__tests__/datePicker.test.js
@@ -1,18 +1,17 @@
-import DatePicker from "../src/datePicker";
+import DatePicker from '../src/datePicker';
 
 jest.useFakeTimers();
 let datePicker;
 const containerId = 'test-container';
 
 describe('DatePicker', () => {
-
   beforeEach(() => {
     document.body.innerHTML = `<div id="${containerId}"></div>`;
     datePicker = new DatePicker(containerId, {
       mode: 'single',
       onSelect: jest.fn(),
       blockedDays: [0, 6], // Sundays and Saturdays
-      showDayNames: true
+      showDayNames: true,
     });
     datePicker.init();
   });
@@ -32,7 +31,7 @@ describe('DatePicker', () => {
         mode: 'single',
         onSelect: null,
         blockedDays: [],
-        showDayNames: true
+        showDayNames: true,
       });
     });
 
@@ -65,7 +64,6 @@ describe('DatePicker', () => {
     });
   });
 
-
   describe('Corner Style', () => {
     test('applies round style by default', () => {
       datePicker = new DatePicker(containerId, {});