isISO8601 strict mode bug: it fails if month and day are both 2 digits

lib/isISO8601.js

@@ -32,13 +32,15 @@ var isValidDate = function isValidDate(str) {
   var match = str.match(/(\d{4})-?(\d{0,2})-?(\d*)/).map(Number);
   var year = match[1];
   var month = match[2];
-  var day = match[3]; // create a date object and compare
+  var day = match[3];
+  var monthString = month ? "0".concat(month).slice(-2) : month;
+  var dayString = day ? "0".concat(day).slice(-2) : day; // create a date object and compare
 
-  var d = new Date("".concat(year, "-").concat(month || 1, "-").concat(day || 1));
-  if (isNaN(d.getFullYear())) return false;
+  var d = new Date("".concat(year, "-").concat(monthString || '01', "-").concat(dayString || '01'));
+  if (isNaN(d.getUTCFullYear())) return false;
 
   if (month && day) {
-    return d.getFullYear() === year && d.getMonth() + 1 === month && d.getDate() === day;
+    return d.getUTCFullYear() === year && d.getUTCMonth() + 1 === month && d.getUTCDate() === day;
   }
 
   return true;

src/lib/isISO8601.js

@@ -22,13 +22,16 @@ const isValidDate = (str) => {
   const year = match[1];
   const month = match[2];
   const day = match[3];
+  const monthString = month ? `0${month}`.slice(-2) : month;
+  const dayString = day ? `0${day}`.slice(-2) : day;
+
   // create a date object and compare
-  const d = new Date(`${year}-${month || 1}-${day || 1}`);
-  if (isNaN(d.getFullYear())) return false;
+  const d = new Date(`${year}-${monthString || '01'}-${dayString || '01'}`);
+  if (isNaN(d.getUTCFullYear())) return false;
   if (month && day) {
-    return d.getFullYear() === year
-      && (d.getMonth() + 1) === month
-      && d.getDate() === day;
+    return d.getUTCFullYear() === year
+      && (d.getUTCMonth() + 1) === month
+      && d.getUTCDate() === day;
   }
   return true;
 };

test/validators.js

@@ -5636,6 +5636,7 @@ describe('Validators', () => {
     '2010-02-18T16,2283',
     '2009-05-19 143922.500',
     '2009-05-19 1439,55',
+    '2009-10-10',
   ];
 
   const invalidISO8601 = [

validator.js

@@ -1575,13 +1575,15 @@ var isValidDate = function isValidDate(str) {
   var match = str.match(/(\d{4})-?(\d{0,2})-?(\d*)/).map(Number);
   var year = match[1];
   var month = match[2];
-  var day = match[3]; // create a date object and compare
+  var day = match[3];
+  var monthString = month ? "0".concat(month).slice(-2) : month;
+  var dayString = day ? "0".concat(day).slice(-2) : day; // create a date object and compare
 
-  var d = new Date("".concat(year, "-").concat(month || 1, "-").concat(day || 1));
-  if (isNaN(d.getFullYear())) return false;
+  var d = new Date("".concat(year, "-").concat(monthString || '01', "-").concat(dayString || '01'));
+  if (isNaN(d.getUTCFullYear())) return false;
 
   if (month && day) {
-    return d.getFullYear() === year && d.getMonth() + 1 === month && d.getDate() === day;
+    return d.getUTCFullYear() === year && d.getUTCMonth() + 1 === month && d.getUTCDate() === day;
   }
 
   return true;