String formatRupiah(double number) {
  final rounded = number.round();
  final formatted = rounded
      .toString()
      .replaceAllMapped(RegExp(r'\B(?=(\d{3})+(?!\d))'), (m) => '.');
  return 'Rp $formatted';
}

String formatTanggal(DateTime date) {
  const bulan = [
    'Jan', 'Feb', 'Mar', 'Apr', 'Mei', 'Jun',
    'Jul', 'Agu', 'Sep', 'Okt', 'Nov', 'Des'
  ];
  return '${date.day} ${bulan[date.month - 1]} ${date.year}';
}

String formatWaktu(DateTime date) {
  final j = date.hour.toString().padLeft(2, '0');
  final m = date.minute.toString().padLeft(2, '0');
  return '$j:$m';
}

String uid() {
  return DateTime.now().microsecondsSinceEpoch.toRadixString(36) +
      (DateTime.now().millisecond).toRadixString(36);
}