Disable specific weekdays in Cornerstone Date Picker elements

Support
#1

Hello,

I am using the Date Picker elements in Cornerstone Forms and I would like to know whether it is possible, using only Cornerstone settings, to disable some days of the week, for example Sundays only.

My goal is simple:

  • keep the Date Picker in single mode
  • prevent users from selecting Sunday
  • keep all the native settings configured in the Cornerstone UI

What I tried:

  • initializing Flatpickr with custom JavaScript
  • using a selector on my field and adding a disable function for Sundays

Example:

document.addEventListener('DOMContentLoaded', function () {
  if (typeof flatpickr !== "undefined") {
    document.querySelectorAll(".notsundays").forEach(function(el) {
      if (!el._flatpickr) {
        flatpickr(el, {
          mode: "single",
          dateFormat: "Y-m-d",
          disable: [
            function(date) {
              return date.getDay() === 0;
            }
          ]
        });
      }
    });
  }
});

The problem is that as soon as I do this, it seems to override the settings already defined in Cornerstone for that field. So I lose the benefit of configuring the Date Picker directly in the builder.

My questions are:

  • Is there a way to disable specific weekdays, such as Sundays, directly in Cornerstone, without custom JS?
  • If not, is there a recommended way to extend the existing Date Picker / Flatpickr instance without replacing the Cornerstone configuration?
  • More generally, is there an official method for adding Flatpickr options like disable while preserving the field settings made in the UI?

Thanks.