answer: Mr. Brown tells #Person1# today is tuesday, and #Person1# realises that #Person1# has an appointment tonight and has to go.
documents: #Person1#: What's the date today Mr. Brown. I don't have a calendar. 
  #Person2#: Today is Tuesday, 25th September, 2001. 
  #Person1#: 25th Sep? Oh, I have an appointment tonight. 
  #Person2#: What time is your appointment? 
  #Person1#: It is at 8 o'clock . 
  #Person2#: What time is now? Do you have the correct time? 
  #Person1#: I don't know what time it is. It must be about 6 o'clock. I have to go now. I don't want to be late. 
  #Person2#: You won't be late. It's still early.