As you can see in the below screenshots, the year "2016" is shown on June but not September: 从截图可以看到，标题栏中，六月有显示年份，九月却没有： <img width="302" alt="screen shot 2016-06-20 at 1 30 21 pm" src="https://cloud.githubusercontent.com/assets/13585047/16184038/755fb304-36eb-11e6-99b3-46a2565c7a0a.png"> <img width="301" alt="screen shot 2016-06-20 at 1 30 32 pm" src="https://cloud.githubusercontent.com/assets/13585047/16184039/7607e3b2-36eb-11e6-98af-bb526b651426.png"> Is this a bug? 是 Bug 吗？
As you can see in the below screenshots, the year "2016" is shown on June but not September:
从截图可以看到，标题栏中，六月有显示年份，九月却没有：
Is this a bug? 是 Bug 吗？