Toju/toju-app/src/app/domains/game-activity/domain/game-activity-time.ts

export function formatGameActivityElapsed(startedAt: number, now = Date.now()): string {
  const elapsedSeconds = Math.max(0, Math.floor((now - startedAt) / 1000));
  const hours = Math.floor(elapsedSeconds / 3600);
  const minutes = Math.floor((elapsedSeconds % 3600) / 60);
  const seconds = elapsedSeconds % 60;

  return [
    hours,
    minutes,
    seconds
  ]
    .map((value) => value.toString().padStart(2, '0'))
    .join(':');
}