fix && feat(): Use isISOPartialDateString && Add tests

Author: marker dao ®

packages/devextreme/js/__internal/core/utils/m_date_serialization.ts

@@ -7,9 +7,9 @@ const NUMBER_SERIALIZATION_FORMAT = 'number';
 const DATE_SERIALIZATION_FORMAT = 'yyyy/MM/dd';
 const DATETIME_SERIALIZATION_FORMAT = 'yyyy/MM/dd HH:mm:ss';
 
+const ISO_PARTIAL_DATE_PATTERN = /^\d{4,}(-\d{2})?$/;
 const ISO8601_PATTERN = /^(\d{4,})(-)?(\d{2})(-)?(\d{2})(?:T(\d{2})(:)?(\d{2})?(:)?(\d{2}(?:\.(\d{1,3})\d*)?)?)?(Z|([+-])(\d{2})(:)?(\d{2})?)?$/;
 const ISO8601_TIME_PATTERN = /^(\d{2}):(\d{2})(:(\d{2}))?$/;
-
 const ISO8601_PATTERN_PARTS = ['', 'yyyy', '', 'MM', '', 'dd', 'THH', '', 'mm', '', 'ss', '.SSS'];
 const DATE_SERIALIZATION_PATTERN = /^(\d{4})\/(\d{2})\/(\d{2})$/;
 
@@ -35,8 +35,8 @@ function createLocalDateFromUTCTimestamp(timestamp: number): Date {
   return new Date(utc.getUTCFullYear(), utc.getUTCMonth(), utc.getUTCDate());
 }
 
-function hasNoTimeOrTimezone(text: string): boolean {
-  return isString(text) && !text.includes('T') && !text.includes(':');
+function isISOPartialDateString(text: string): boolean {
+  return ISO_PARTIAL_DATE_PATTERN.test(text);
 }
 
 function parseDate(text): string | Date {
@@ -63,7 +63,7 @@ function parseDate(text): string | Date {
     return text;
   }
 
-  return hasNoTimeOrTimezone(text)
+  return isISOPartialDateString(text)
     ? createLocalDateFromUTCTimestamp(parsedValue)
     : new Date(parsedValue);
 }
@@ -195,6 +195,7 @@ const getDateSerializationFormat = function (value) {
 };
 
 const dateSerialization = {
+  createLocalDateFromUTCTimestamp,
   dateParser,
   deserializeDate,
   serializeDate,

packages/devextreme/testing/tests/DevExpress.core/utils.date_serialization.tests.js

@@ -107,6 +107,26 @@ QUnit.test('deserializing first date (serialization format is string)', function
     assert.deepEqual(result, date, 'date is returned');
 });
 
+QUnit.test('deserializing year-only string should return correct year (T1323373)', function(assert) {
+    const result = dateSerialization.deserializeDate('2026');
+
+    assert.ok(result instanceof Date, 'result is a Date');
+    assert.equal(result.getFullYear(), 2026, 'year is 2026');
+    assert.equal(result.getMonth(), 0, 'month is January');
+    assert.equal(result.getDate(), 1, 'day is 1');
+});
+
+QUnit.test('createLocalDateFromUTCTimestamp returns local date with UTC components', function(assert) {
+    const utcTimestamp = Date.UTC(2026, 0, 1);
+    const result = dateSerialization.createLocalDateFromUTCTimestamp(utcTimestamp);
+
+    assert.ok(result instanceof Date, 'result is a Date');
+    assert.equal(result.getFullYear(), 2026, 'year matches UTC year');
+    assert.equal(result.getMonth(), 0, 'month matches UTC month');
+    assert.equal(result.getDate(), 1, 'date matches UTC date');
+    assert.equal(result.getHours(), 0, 'hours are 0');
+});
+
 QUnit.test('serialization ISO8601 dates', function(assert) {
     const date = new Date(2015, 3, 5, 6, 7, 25, 125);