diff --git a/package-lock.json b/package-lock.json
index 061b48eca0..028e67c56b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -43,7 +43,6 @@
         "sortablejs": "1.15.3",
         "swagger-ui-dist": "5.17.14",
         "tailwindcss": "3.4.13",
-        "temporal-polyfill": "0.2.4",
         "throttle-debounce": "5.0.0",
         "tinycolor2": "1.6.0",
         "tippy.js": "6.3.7",
@@ -15417,21 +15416,6 @@
         "node": ">=6"
       }
     },
-    "node_modules/temporal-polyfill": {
-      "version": "0.2.4",
-      "resolved": "https://registry.npmjs.org/temporal-polyfill/-/temporal-polyfill-0.2.4.tgz",
-      "integrity": "sha512-WA5p0CjQTkMjF9m8sP4wSYgpqI8m2d4q7wPUyaJOWhy4bI9mReLb2yGvTV4qf/DPMTe6H6M/Dig5KmTMB7ev6Q==",
-      "license": "MIT",
-      "dependencies": {
-        "temporal-spec": "^0.2.4"
-      }
-    },
-    "node_modules/temporal-spec": {
-      "version": "0.2.4",
-      "resolved": "https://registry.npmjs.org/temporal-spec/-/temporal-spec-0.2.4.tgz",
-      "integrity": "sha512-lDMFv4nKQrSjlkHKAlHVqKrBG4DyFfa9F74cmBZ3Iy3ed8yvWnlWSIdi4IKfSqwmazAohBNwiN64qGx4y5Q3IQ==",
-      "license": "ISC"
-    },
     "node_modules/terser": {
       "version": "5.36.0",
       "resolved": "https://registry.npmjs.org/terser/-/terser-5.36.0.tgz",
diff --git a/package.json b/package.json
index 42c0b29cc4..3c23d8dfbe 100644
--- a/package.json
+++ b/package.json
@@ -42,7 +42,6 @@
     "sortablejs": "1.15.3",
     "swagger-ui-dist": "5.17.14",
     "tailwindcss": "3.4.13",
-    "temporal-polyfill": "0.2.4",
     "throttle-debounce": "5.0.0",
     "tinycolor2": "1.6.0",
     "tippy.js": "6.3.7",
diff --git a/web_src/js/webcomponents/absolute-date.js b/web_src/js/webcomponents/absolute-date.js
index d2be455302..32f0ad7d13 100644
--- a/web_src/js/webcomponents/absolute-date.js
+++ b/web_src/js/webcomponents/absolute-date.js
@@ -1,30 +1,29 @@
-import {Temporal} from 'temporal-polyfill';
-
-export function toAbsoluteLocaleDate(dateStr, lang, opts) {
-  return Temporal.PlainDate.from(dateStr).toLocaleString(lang ?? [], opts);
+export function toAbsoluteLocaleDate(date, lang, opts) {
+  // only use the date part, it is guaranteed to be in ISO format (YYYY-MM-DDTHH:mm:ss.sssZ) or (YYYY-MM-DD)
+  // if there is an "Invalid Date" error, there must be something wrong in code and should be fixed.
+  // TODO: there is a root problem in backend code: the date "YYYY-MM-DD" is passed to backend without timezone (eg: deadline),
+  // then backend parses it in server's timezone and stores the parsed timestamp into database.
+  // If the user's timezone is different from the server's, the date might be displayed in the wrong day.
+  const dateSep = date.indexOf('T');
+  date = dateSep === -1 ? date : date.substring(0, dateSep);
+  return new Date(`${date}T00:00:00`).toLocaleString(lang || [], opts);
 }
 
 window.customElements.define('absolute-date', class extends HTMLElement {
   static observedAttributes = ['date', 'year', 'month', 'weekday', 'day'];
 
+  initialized = false;
+
   update = () => {
-    const year = this.getAttribute('year') ?? '';
-    const month = this.getAttribute('month') ?? '';
-    const weekday = this.getAttribute('weekday') ?? '';
-    const day = this.getAttribute('day') ?? '';
+    const opt = {};
+    for (const attr of ['year', 'month', 'weekday', 'day']) {
+      if (this.getAttribute(attr)) opt[attr] = this.getAttribute(attr);
+    }
     const lang = this.closest('[lang]')?.getAttribute('lang') ||
       this.ownerDocument.documentElement.getAttribute('lang') || '';
 
-    // only use the first 10 characters, e.g. the `yyyy-mm-dd` part
-    const dateStr = this.getAttribute('date').substring(0, 10);
-
     if (!this.shadowRoot) this.attachShadow({mode: 'open'});
-    this.shadowRoot.textContent = toAbsoluteLocaleDate(dateStr, lang, {
-      ...(year && {year}),
-      ...(month && {month}),
-      ...(weekday && {weekday}),
-      ...(day && {day}),
-    });
+    this.shadowRoot.textContent = toAbsoluteLocaleDate(this.getAttribute('date'), lang, opt);
   };
 
   attributeChangedCallback(_name, oldValue, newValue) {
diff --git a/web_src/js/webcomponents/absolute-date.test.js b/web_src/js/webcomponents/absolute-date.test.js
index ba04451b65..dfd82e3cf1 100644
--- a/web_src/js/webcomponents/absolute-date.test.js
+++ b/web_src/js/webcomponents/absolute-date.test.js
@@ -7,9 +7,20 @@ test('toAbsoluteLocaleDate', () => {
     day: 'numeric',
   })).toEqual('March 15, 2024');
 
-  expect(toAbsoluteLocaleDate('2024-03-15', 'de-DE', {
+  expect(toAbsoluteLocaleDate('2024-03-15T01:02:03', 'de-DE', {
     year: 'numeric',
     month: 'long',
     day: 'numeric',
   })).toEqual('15. März 2024');
+
+  // these cases shouldn't happen
+  expect(toAbsoluteLocaleDate('2024-03-15 01:02:03', '', {})).toEqual('Invalid Date');
+  expect(toAbsoluteLocaleDate('10000-01-01', '', {})).toEqual('Invalid Date');
+
+  // test different timezone
+  const oldTZ = process.env.TZ;
+  process.env.TZ = 'America/New_York';
+  expect(new Date('2024-03-15').toLocaleString()).toEqual('3/14/2024, 8:00:00 PM');
+  expect(toAbsoluteLocaleDate('2024-03-15')).toEqual('3/15/2024, 12:00:00 AM');
+  process.env.TZ = oldTZ;
 });