frontend/src/utils/format-time-delta.ts

/**
 * Formats a date into a compact string representing the time delta between the given date and the current date.
 * @param date The date to format
 * @returns A compact string representing the time delta between the given date and the current date
 *
 * @example
 * // now is 2024-01-01T00:00:00Z
 * formatTimeDelta(new Date("2023-12-31T23:59:59Z")); // "1s"
 * formatTimeDelta(new Date("2022-01-01T00:00:00Z")); // "2y"
 */
export const formatTimeDelta = (date: Date) => {
  const now = new Date();
  const delta = now.getTime() - date.getTime();

  const seconds = Math.floor(delta / 1000);
  const minutes = Math.floor(seconds / 60);
  const hours = Math.floor(minutes / 60);
  const days = Math.floor(hours / 24);
  const months = Math.floor(days / 30);
  const years = Math.floor(months / 12);

  if (seconds < 60) return `${seconds}s`;
  if (minutes < 60) return `${minutes}m`;
  if (hours < 24) return `${hours}h`;
  if (days < 30) return `${days}d`;
  if (months < 12) return `${months}mo`;
  return `${years}y`;
};