Timing
The date is already real.
Some sales are difficult because of money. Others are difficult because a date exists and the house has to meet it.
Four patterns
The next home is already firm
Two dates have to speak to each other. Dave prices and negotiates against the purchase you have already signed. Your lawyer reads what that agreement still allows.
An estate
Authority to sign may still be forming. Valeo will not advertise a sale as if that authority already exists. The estate lawyer leads that question.
A family or business dispute
A court order or a separation agreement can decide who consents. Bring that constraint at the start. If the sale should also stay quiet, see sell privately.
A relocation
A job or a school term can be firm while the house is not. The plan names what must happen before photos, and what happens if you have already left. Vacant-property care, if needed, is a separate appointment. See property management.
If the date is coming from a lender, read selling during a power of sale.