const monthNames = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];
  
            //create order date (will be created in UTC as milliseconds)
            let orderDate = new Date();
            let orderDateTimeInMs = orderDate.getTime();

            //access delivery hours, minutes and whether it is am or pm
            let hrs = event.newValue.hrs;
            let mins = event.newValue.mins;
            let ampm = event.newValue.hourFormat;

            //get timezoneOffset from user profile (channel)
            let timezoneOffset = context.getVariable('profile.timezoneOffset');

            //determine max delivery time in milliseconds
            let orderDay = orderDate.getDate();
            let orderMonth = monthNames[orderDate.getMonth()];
            let orderYear = orderDate.getFullYear();
            let maxDeliveryTimeInMilliseconds = (new Date(orderMonth + " " + orderYear + ", " + orderDay + " 8:30 pm")).getTime() + (timezoneOffset != null? timezoneOffset:0);

            //compose delivery date string from order date day, month, year and 
            //the hours and min information passed through the TIME entity. This
            //avoids people ordering pizza e.g. for tomorrow or yesterday
            let deliveryDateString = monthNames[orderDate.getMonth()] + " " +
              orderDate.getFullYear() + ", " +
              orderDate.getDate() + " " +
              hrs + ":" + mins + " " + ampm;
            
            //delivery date should consider timezoneOffset if available
            let deliveryDateInMilliseconds = (new Date(deliveryDateString)).getTime() + (timezoneOffset != null? timezoneOffset:0);

            //hours and minutes cannot both be 0
            if ((hrs == 0) && (mins == 0)) {
              let message = "Please enter a time. Pizzas are delivered the same day. Orders must be placed 60 minutes before delivery, but at the latest at 8:30 p.m.";
              context.addValidationError('DeliveryTime', message);
              return false;
            }

            //check if shop is closed for deliveries, which is for when order time plus pizza 
            //creation time is later than max delivery time 
            if ((orderDateTimeInMs + 3600000) > maxDeliveryTimeInMilliseconds) {
              let message = "Sorry, but I only accept orders until 8:30 p.m. All orders after 8.30 pm must be processed by an employee";
              context.addMessage(message, true)                            
              context.cancel();
              return false;
            }
            
            //delivery is for "pm" hours until 9:30
            if (ampm.toLowerCase() === 'am') {
              let message = "Sorry, we only deliver from 12 pm to 9.30 pm. Orders must be received 60 minutes before delivery, that is, at 8:30 pm at the latest. Please choose another time.";
              context.addValidationError('DeliveryTime', message);
              return false;
            }
            
            //is delivery time in future? If it is not, raise validation error.           
            if (deliveryDateInMilliseconds < orderDateTimeInMs) {              
              let message = "The delivery time cannot be in the past. Please enter a time that is at least 60 minutes ahead of the current time.";
              context.addValidationError('DeliveryTime', message);
              return false;
            }

            //is requested delivery time outside delivery hours?
            if (deliveryDateInMilliseconds > maxDeliveryTimeInMilliseconds) {              
              let message = "We deliver until 9:30 pm. Orders must be placed 60 minutes before delivery. Please try again.";
              context.addValidationError('DeliveryTime', message);
              return false;
            }

            //is delivery within 60 minutes? If so, ask user to change to later
            if (deliveryDateInMilliseconds < (orderDateTimeInMs + 3600000)) {
              let message = "Quality takes time. We need at least 60 minutes to create the pizza. Please provide a new delivery time";
              context.addValidationError('DeliveryTime', message);
              return false;
            }

            return true;