Date & time field restrictions

Hi together,

I’m using the FS Contact Form with both date and time fields.

Is it possible, to restrict the input?

e.g.

calender – only 15/03/2016-18/03/2016 available
time – only 9 a.m. – 5 p.m. available

Thanks in advance!

https://wordpress.org/plugins/si-contact-form/