1, the day after tomorrow, how many tomorrows are there: just wait for tomorrow, the day after tomorrow, how many tomorrows are there. It warns people to cherish every moment and try their best to finish today. The "day" here means daytime.
2. Jiangling in a day: refers to Jiangling that can reach thousands of miles away in a day. The word "day" here also means daytime.
3. Don't wait until the Ming Dynasty to regret the present when you achieve your career today: it means to cherish time and seize every moment, and don't wait until later to regret that you haven't worked hard now. After today, you won't regret it. Here, the word "day" means a day.