ETL datetime to integer error code - sql

Question

I'm writing an ETL in visual studio 2017 and I am getting this error:
So, I can't convert datetime datatype to integer datatype.
But the problem is, my query returns an int and not a datetime datatype.
Query:
SELECT e.eventName, e.eventType, e.numberOfPersons,
(SELECT timeKey FROM StarSchema.dbo.timeDim WHERE (r.reservationDate = [DATE])) AS reservationDate,
(SELECT timeKey FROM StarSchema.dbo.timeDim AS timeDim_2 WHERE (e.eventStartDate = [DATE])) AS eventStartDate,
(SELECT timeKey FROM StarSchema.dbo.timeDim AS timeDim_1 WHERE (e.eventEndDate = [DATE])) AS eventEndDate,
contact.name, customer.company, invoices.price, invoices.invoiceId
FROM events AS e
INNER JOIN reservation AS r ON e.reservationId = r.reservationId
INNER JOIN customer ON e.customerId = customer.customerId
INNER JOIN contact ON customer.contactId = contact.contactId
INNER JOIN invoices ON e.invoiceId = invoices.invoiceId
This is the result when I run this query:
The reservationDate, eventStartDate and eventEndDate reference a key in my time dimension, as an int not a datetime.
I tried creating a view with this query and then using it in my ETL but Visual studio still processed the columns as the datetime datatype.
Any suggestions?
**EDIT: So to be clear,, my goal is to have the datatype return as an INT and not a date datatype. I need the INT to reference my time dimension.

Answer 1

Try it with a CAST as DATE on the inside:
SELECT e.eventName, e.eventType, e.numberOfPersons,
(SELECT CAST (timeKey AS DATE) FROM ArenAStar.dbo.timeDim WHERE
(r.reservationDate = [DATE])) AS reservationDate,
(SELECT CAST (timeKey AS DATE) FROM ArenAStar.dbo.timeDim AS timeDim_2
WHERE
(e.eventStartDate = [DATE])) AS eventStartDate,
(SELECT timeKey FROM ArenAStar.dbo.timeDim AS timeDim_1 WHERE
(e.eventEndDate = [DATE])) AS eventEndDate,
contact.name, customer.company, invoices.price, invoices.invoiceId
FROM events AS e
INNER JOIN reservation AS r ON e.reservationId = r.reservationId
INNER JOIN customer ON e.customerId = customer.customerId
INNER JOIN contact ON customer.contactId = contact.contactId
INNER JOIN invoices ON e.invoiceId = invoices.invoiceId