backend/libs/common/src/helper/date-format.ts

export function toDDMMYYYY(dateString?: string | null): string | null {
  if (!dateString) return null;

  // Ensure dateString is valid format YYYY-MM-DD
  const regex = /^\d{4}-\d{2}-\d{2}$/;
  if (!regex.test(dateString)) {
    throw new Error(
      `Invalid date format: ${dateString}. Expected format is YYYY-MM-DD`,
    );
  }

  const [year, month, day] = dateString.split('-');
  return `${day}-${month}-${year}`;
}
export function toMMYYYY(dateString?: string | null): string | null {
  if (!dateString) return null;

  // Ensure dateString is valid format YYYY-MM
  const regex = /^\d{4}-\d{2}$/;
  if (!regex.test(dateString)) {
    throw new Error(
      `Invalid date format: ${dateString}. Expected format is YYYY-MM`,
    );
  }

  const [year, month] = dateString.split('-');
  return `${month}-${year}`;
}
export function filterByMonth(data: any[], monthDate: string) {
  const [year, month] = monthDate.split('-').map(Number);

  return data.filter((item) => {
    const itemDate = new Date(item.date);
    return (
      itemDate.getUTCFullYear() === year && itemDate.getUTCMonth() + 1 === month
    );
  });
}