Extended form - StoP Auto Date or Place a condition

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Hi Guys,

I have installed extended form on my sitewww.www.fmhlimousines.com.au/booking...

The form automatically shows current date and time. It is a required field for booking.

I wish to disable Auto current date as it confuses the users and often they forget to specify the pick up date and time.

if not, can i put a condition of minimum 12 hours notice. for example;
if current time is 06:00am and user is trying to make a booking for 09:00am then the form should not proceed any further and the user should see a message
"minimum 12 hour notice required for all bookings - for urgent booking please call us"

please help.

Thank you.