Step-by-step explanation:
The argument between Jan and Dan is a result of miscommunication and misunderstanding of the agreed upon time for their date. Jan believed that the date was at 6pm, while Dan thought it was at 8pm. This discrepancy in their understanding of the time led to Dan showing up two hours late, which caused Jan to become upset and argue with him. The situation could have been avoided if they had double-checked the time and confirmed it with each other before the scheduled date.