When they arrive, the date will be over, and the situation will be one Sim visiting another.
A Sim who is already Downtown can approach another Sim and say "Let's Date" or "Let's Hang Out".
The controllable Sim will be able to use the "Ask About Mood" interaction to determine which motive his or her date wants to fulfill at that moment.
Dating is a romantic activity where two Sims spend their time doing romantic things together.
This feature is the main theme of The Sims: Hot Date and The Sims 2: Nightlife.
A Sim's date will follow him/her and do activities together while they fill up the date meter and fulfill their wants before the time runs out.