First available date
The first available date is the earliest day you can let the car go. It starts the search for a truck. It is not a pickup appointment, and it does not mean a driver is booked for that morning.
The first available date is the first day the car, the keys, and a person to meet the driver can all be ready. Brokers use it to tell carriers when the load is open. A carrier may arrive that day, a later day inside the pickup window, or not at all if nobody accepts the rate.
What to put on the order
Use a date you can actually meet. If you will still be driving the car, or the title will not be ready, do not list tomorrow to make the quote look flexible. A missed pickup is a common reason for a new price. If you need the car held until a real date, say so. Flexibility can make a load easier to cover. It does not create a clock-time appointment.
How it differs from a pickup window
The first available date is one day: the start. The pickup window is a span, often several days, during which the driver may come. A line that says the pickup is set for a single hour has to be written as its own promise, with a remedy if the truck misses it. The date you typed into a quote form is not that promise. RideShipper does not schedule the truck.