Unable to custom time field.

I attempted to create a custom JavaScript function to control the time field. This condition checks whether the selected date is today. If it is, the available hours will be limited to the remaining hours of the day. For example, if today’s date is selected and the current time is 15:00, only time slots after 17:00 will be displayed.

Here is the code I created:

// Function to filter available time options based on the current time
function updateTimeOptions() {
    var dateInput = $('input[name="date-1"]').val();  // Get the value from the date input field
    var hoursSelect = $('select[name="time-2-hours"]');  // The hours dropdown

    var serverTime = new Date(ajax_object.server_time); // Get the server time passed from PHP

    if (!dateInput) return; // Stop if no date is selected

    // Convert dd-mm-yyyy to yyyy-mm-dd format
    var dateParts = dateInput.split('-');
    var formattedDate = new Date(dateParts[2], dateParts[1] - 1, dateParts[0]);  // Convert to a valid Date object

    var currentTime = new Date(serverTime); // Create a Date object for the current server time

    // Reset currentTime and formattedDate to midnight for date-only comparison
    currentTime.setHours(0, 0, 0, 0);
    formattedDate.setHours(0, 0, 0, 0);

    // Get the current hour from the server time
    var currentHour = serverTime.getHours();
    var minHour = currentHour + 2; // Allow selection from 2 hours ahead

    // Save original hour options only once
    if (!hoursSelect.data('original-options')) {
        hoursSelect.data('original-options', hoursSelect.find('option').clone());
    }

    // Restore the original hour options
    hoursSelect.empty().append(hoursSelect.data('original-options').clone());

    // Check if the selected date is today
    var isToday = formattedDate.getTime() === currentTime.getTime();

    // If today is selected, filter hours to only show those >= current time + 2 hours
    if (isToday) {
        hoursSelect.find('option').each(function () {
            var hourValue = parseInt($(this).val(), 10);

            if (isNaN(hourValue)) return; // Skip if it's not a valid hour value

            // Remove options that are less than the minimum allowed hour
            if (hourValue < minHour) {
                $(this).remove();
            }
        });
    }

    // If no valid options remain, show a fallback message
    if (hoursSelect.find('option').length === 0) {
        hoursSelect.append('<option value="">No available hours</option>');
    }
}

// Run the function when the date input changes
$('input[name="date-1"]').on('change', function () {
    updateTimeOptions();
});

// Run the function immediately when the page loads in case the date is already selected
$(document).ready(function () {
    updateTimeOptions();
});

This code successfully filters the time as expected; however, it prevents the form from being submitted.

I could not verify what exactly causing this.