先看效果

代码如下

   private IEnumerator ShowTimer()
   {
       while (true)
       {
           yield return new WaitForSeconds(1f);
           DateTime currentDateTime = DateTime.Now;

           // 获取星期几的中文名称
           string dayOfWeek = currentDateTime.ToString("dddd", new CultureInfo("zh-CN"));

           // 格式化时间
           string formattedDate = currentDateTime.ToString("yyyy年M月d日 ") + dayOfWeek + " " +
                                  currentDateTime.ToString("HH:mm:ss");
           timer.text = formattedDate;
       }
   }
// StartCoroutine(ShowTimer());开启该协程