Populating Drop Down list from Form

Populating Drop Down list from Form

I am creating a class website that will have information for my students regarding test, homework, and other information. I would also like to add a scheduler so that the students can set up times to come see me. I know basic html but I am not familiar with databases which I learned is need to populate the fields for the scheduler. I thought Zoho would be the solution to my problem however after creating the form Im wondering is it possible to connect the information from the database to the drop down list created on my website.

For example:
Through Zoho I created a form where I will be able to enter the dates and times I am available. I would like for these dates to show up on the drop down list I have created on my website. 

Any help will be greatly appreciated. Thanks!