From 2c4aedea6164cb8e10011fa90aabde64fc5751b0 Mon Sep 17 00:00:00 2001
From: Tomas Panek <34172483+tomaspanek@users.noreply.github.com>
Date: Fri, 18 Aug 2023 07:42:45 -0500
Subject: [PATCH] fix(isDate): Timezone Offset Fix (#2257)

* Timezone Offset Fix & Parsing with Leading Zeros

* `isDate` Timezone Mock Test, Support for NodeJS <8

* `isDate` Unit Test Resiliency Improvement
---
 package.json            |  1 +
 src/lib/isDate.js       | 14 +++++++++++++-
 test/validators.test.js | 12 ++++++++++++
 3 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/package.json b/package.json
index 3f088d3ce..153e5c1a4 100644
--- a/package.json
+++ b/package.json
@@ -51,6 +51,7 @@
     "rimraf": "^3.0.0",
     "rollup": "^0.47.0",
     "rollup-plugin-babel": "^4.0.1",
+    "timezone-mock": "^1.3.6",
     "uglify-js": "^3.0.19"
   },
   "scripts": {
diff --git a/src/lib/isDate.js b/src/lib/isDate.js
index 9f1c6926b..f0b28917a 100644
--- a/src/lib/isDate.js
+++ b/src/lib/isDate.js
@@ -65,7 +65,19 @@ export default function isDate(input, options) {
       }
     }
 
-    return new Date(`${fullYear}-${dateObj.m}-${dateObj.d}`).getDate() === +dateObj.d;
+    let month = dateObj.m;
+
+    if (dateObj.m.length === 1) {
+      month = `0${dateObj.m}`;
+    }
+
+    let day = dateObj.d;
+
+    if (dateObj.d.length === 1) {
+      day = `0${dateObj.d}`;
+    }
+
+    return new Date(`${fullYear}-${month}-${day}T00:00:00.000Z`).getUTCDate() === +dateObj.d;
   }
 
   if (!options.strictMode) {
diff --git a/test/validators.test.js b/test/validators.test.js
index 6bf812d15..8fa0f04ae 100644
--- a/test/validators.test.js
+++ b/test/validators.test.js
@@ -1,5 +1,6 @@
 import assert from 'assert';
 import fs from 'fs';
+import timezone_mock from 'timezone-mock';
 import { format } from 'util';
 import vm from 'vm';
 import validator from '../src/index';
@@ -13054,6 +13055,17 @@ describe('Validators', () => {
         '29.02.2020',
       ],
     });
+    // emulating Pacific time zone offset & time
+    // which could potentially result in UTC conversion issues
+    timezone_mock.register('US/Pacific');
+    test({
+      validator: 'isDate',
+      valid: [
+        new Date(2016, 2, 29),
+        '2017-08-04',
+      ],
+    });
+    timezone_mock.unregister();
   });
   it('should validate time', () => {
     test({