Tutorial on a task scheduler with a webserver?

I know there's code out there for a time scheduler, but I was wondering how you would go about this on a webserver?

ie: I have a web page where the user can go put in a date and time to schedule an automatic dog feeder. How would you go about the input of the textbox (where they put the date & time) and putting into the scheduler in the sketch?

I was gonna do something like this with some jquery.

Like this task scheduler library here.

Using a text box in a web page is usually to send text. You could use buttons that are precoded to send specific values.