生日倒计时 — 实时显示剩余天数

Days  :  Hours  :  Minutes  :  Seconds
 042      08        31          07

if (today > thisYearBirthday) {
  thisYearBirthday = new Date(today.getFullYear() + 1, month - 1, day);
}

export interface BirthdayPerson {
  name: string;
  nickname?: string;
  birthday: {
    month: number; // 1-12
    day: number;   // 1-31
  };
  greeting?: string;
}