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import {Temporal} from 'temporal-polyfill';
export function toAbsoluteLocaleDate(dateStr, lang, opts) {
return Temporal.PlainDate.from(dateStr).toLocaleString(lang ?? [], opts);
}
window.customElements.define('absolute-date', class extends HTMLElement {
static observedAttributes = ['date', 'year', 'month', 'weekday', 'day'];
update = () => {
const year = this.getAttribute('year') ?? '';
const month = this.getAttribute('month') ?? '';
const weekday = this.getAttribute('weekday') ?? '';
const day = this.getAttribute('day') ?? '';
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}),
});
};
attributeChangedCallback(_name, oldValue, newValue) {
if (!this.initialized || oldValue === newValue) return;
this.update();
}
connectedCallback() {
this.initialized = false;
this.update();
this.initialized = true;
}
});
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