10.0.0 base

web_src/js/webcomponents/absolute-date.js

@@ -0,0 +1,39 @@
+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 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') || '';
+
+    if (!this.shadowRoot) this.attachShadow({mode: 'open'});
+    this.shadowRoot.textContent = toAbsoluteLocaleDate(this.getAttribute('date'), lang, opt);
+  };
+
+  attributeChangedCallback(_name, oldValue, newValue) {
+    if (!this.initialized || oldValue === newValue) return;
+    this.update();
+  }
+
+  connectedCallback() {
+    this.initialized = false;
+    this.update();
+    this.initialized = true;
+  }
+});