// Shared Temporal display helpers. Storage and logic stay in ISO instants;
// these format one for the viewer in their own timezone.

/** Format an ISO instant in the viewer's timezone. */
export function formatInstant(
	iso: string,
	options: Intl.DateTimeFormatOptions,
): string {
	return Temporal.Instant.from(iso)
		.toZonedDateTimeISO(Temporal.Now.timeZoneId())
		.toLocaleString('fr-FR', options);
}

/** Short day-month stamp ("8 sept."). */

export function formatDayMonth(iso: string): string {
	return formatInstant(iso, { day: 'numeric', month: 'short' });
}

/** Day-month-year stamp ("8 sept. 2026"). */
export function formatDayMonthYear(iso: string): string {
	return formatInstant(iso, {
		day: 'numeric',
		month: 'short',
		year: 'numeric',
	});
}