Help with shipping request form

Help with shipping request form

HelIo, I have a delivery request form, I make a cut of requests every day at 3:00 pm, after this time I no longer attend requests for the next day, in which way I can make an alert appear, when the user later From 3:00 pm select in the field of date and time of delivery, tomorrow, and tell you that you can no longer request that delivery, that you select or capture on the date of the next business day, and do not let it continue filling out the form or not letting you send the form information? until you select or capture date of the next working day? thank you for your support