From e3d3ad45e12d05a9012daada871c67c47f0eac17 Mon Sep 17 00:00:00 2001
From: t1m0n <t1m0n.TR@gmail.com>
Date: Fri, 1 Mar 2024 00:24:48 +0300
Subject: [PATCH] #589 - added conversion from date-only string to local date

---
 src/utils.js          | 15 +++++++++++++++
 tests/options.test.js |  1 -
 tests/utils.test.js   | 34 ++++++++++++++++++++++++++++++++++
 3 files changed, 49 insertions(+), 1 deletion(-)
 create mode 100644 tests/utils.test.js

diff --git a/src/utils.js b/src/utils.js
index 39806cd3..4c7eb822 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -351,6 +351,15 @@ export function deepMerge(target, ...objects) {
     return target;
 }
 
+/**
+ * Checks if ISO date string consists only of numbers
+ * @param {string} dateString
+ * @returns {boolean}
+ */
+function dateStringIsDateOnly(dateString) {
+    return /^\d{4}-\d{2}-\d{2}$/.test(dateString);
+}
+
 /**
  * Creates Date object from string or number. If passed param is instance of Date, then just returns it.
  * @param {number|string|Date} date
@@ -360,6 +369,12 @@ export function createDate(date) {
     let resultDate = date;
 
     if (!(date instanceof Date)) {
+        // If string is date-only string, we should add time to it
+        // so created date will be in a local time
+        // https://github.com/t1m0n/air-datepicker/issues/589
+        if (typeof date === 'string' && dateStringIsDateOnly(date)) {
+            date += 'T00:00:00';
+        }
         resultDate = new Date(date);
     }
 
diff --git a/tests/options.test.js b/tests/options.test.js
index 8a473180..1197f4d3 100644
--- a/tests/options.test.js
+++ b/tests/options.test.js
@@ -1,6 +1,5 @@
 import {beforeAll, afterEach, describe, test, it, expect} from '@jest/globals';
 import Datepicker from 'datepicker';
-import {isSameDate} from 'utils';
 import en from 'locale/en';
 import de from 'locale/de';
 import consts from 'consts';
diff --git a/tests/utils.test.js b/tests/utils.test.js
new file mode 100644
index 00000000..968ebb7b
--- /dev/null
+++ b/tests/utils.test.js
@@ -0,0 +1,34 @@
+import {createDate, getParsedDate} from '../src/utils';
+import {describe, it, expect} from '@jest/globals';
+
+
+describe('createDate', () => {
+    it('should return date object if it receives one', () => {
+        const date = new Date();
+        const createdDate = createDate(date);
+
+        expect(date).toEqual(createdDate);
+    });
+    it('should create date from string', () => {
+        const dateString = '2024-03-01';
+        const createdDate = createDate(dateString);
+
+        expect(createdDate).toBeInstanceOf(Date);
+
+        const {fullDate, fullMonth, year} = getParsedDate(createdDate);
+        const allEqual = year === 2024 && fullMonth === '03' && fullDate === '01';
+
+        expect(allEqual).toBeTruthy();
+    });
+    it('should create date from number', () => {
+        const time = 1709241680707;
+        const createdDate = createDate(time);
+
+        expect(createdDate).toBeInstanceOf(Date);
+
+        const {fullDate, fullMonth, year} = getParsedDate(createdDate);
+        const allEqual = year === 2024 && fullMonth === '03' && fullDate === '01';
+
+        expect(allEqual).toBeTruthy();
+    });
+});