blog/frontend/shared/utils/format.ts

import type { Locale } from './locale'

const INTL_LOCALE: Record<Locale, string> = { it: 'it-IT', en: 'en-GB' }

/** Human-readable date for display; returns an empty string when unset. */
export function formatDate(value: string | null | undefined, locale: Locale = 'it'): string {
  if (!value) return ''
  return new Intl.DateTimeFormat(INTL_LOCALE[locale], { dateStyle: 'long' }).format(new Date(value))
}

/** Date and time of publication, shown in the article byline. */
export function formatDateTime(value: string | null | undefined, locale: Locale = 'it'): string {
  if (!value) return ''
  return new Intl.DateTimeFormat(INTL_LOCALE[locale], { dateStyle: 'long', timeStyle: 'short' })
    .format(new Date(value))
}

/** Machine-readable date for the `datetime` attribute and structured data. */
export function isoDate(value: string | null | undefined): string {
  return value ? new Date(value).toISOString() : ''
}