import { type ClassValue, clsx } from 'clsx';
import { twMerge } from 'tailwind-merge';
export function cn(...inputs: ClassValue[]) {
return twMerge(clsx(inputs));
}
/**
* Parse an ISO date string (YYYY-MM-DD) as local time, not UTC.
*
* JavaScript's `new Date("2025-12-10")` parses as midnight UTC,
* which shifts to the previous day in North American timezones.
* This function parses the date as local time to avoid that issue.
*/
export function parseLocalDate(dateString: string | null | undefined): Date | null {
if (!dateString) return null;
// Handle ISO date strings (YYYY-MM-DD)
if (/^\d{4}-\d{2}-\d{2}$/.test(dateString)) {
const [year, month, day] = dateString.split('-').map(Number);
return new Date(year, month - 1, day);
}
// Fall back to standard Date parsing for other formats
return new Date(dateString);
}
/**
* Format an ISO date string as a localized date, treating it as local time.
*/
export function formatLocalDate(
dateString: string | null | undefined,
options?: Intl.DateTimeFormatOptions
): string {
const date = parseLocalDate(dateString);
if (!date) return '';
return date.toLocaleDateString(undefined, options);
}
