fix(isDate): hyphen before year is not allowed (#2381)

Author: Sumit-tech-joshi

src/lib/isDate.js

@@ -22,7 +22,7 @@ function zip(date, format) {
 }
 
 export default function isDate(input, options) {
-  if (typeof options === 'string') { // Allow backward compatbility for old format isDate(input [, format])
+  if (typeof options === 'string') { // Allow backward compatibility for old format isDate(input [, format])
     options = merge({ format: options }, default_date_options);
   } else {
     options = merge(options, default_date_options);
@@ -49,6 +49,11 @@ export default function isDate(input, options) {
 
     let fullYear = dateObj.y;
 
+    // Check if the year starts with a hyphen
+    if (fullYear.startsWith('-')) {
+      return false; // Hyphen before year is not allowed
+    }
+
     if (dateObj.y.length === 2) {
       const parsedYear = parseInt(dateObj.y, 10);
 

test/validators.test.js

@@ -13087,6 +13087,8 @@ describe('Validators', () => {
         '2019-02-29', // non-leap year
         '2020-04-31', // invalid date
         '2020/03-15', // mixed delimiter
+        '-2020-04-19',
+        '-2023/05/24',
       ],
     });
     test({