sql - Cast int to SmallDateTime

Question

I am trying to compare L.LoanDueDate (which is a smalldatetime) to the return value of ufnARCUGetLatestProcessDate() (which is an int) to see how many days the loan due date is past the last process date.

I receive an

Arithmetic overflow error converting expression to data type smalldatetime

error and can't seem to figure it out. Any help would be useful. Thank you in advance.

CAST(L.LoanDueDate - CAST(CAST((SELECT ProcessDate FROM ufnARCUGetLatestProcessDate()) AS VARCHAR(10)) AS smalldatetime) AS INT)

Answer 1

You can't compare an int to a smalldatetime. You need to compare two dates and for that you'd have to use datediff.

Answer 2

You can cast the date column to int. It will give you the aproximate (rounded) date, without the time part, as an int.

Edit:

This will give you the date as a number for you to compare:

SELECT FLOOR(CAST(L.LoanDueDate as float)) -
(SELECT ProcessDate FROM ufnARCUGetLatestProcessDate()) AS myValue
FROM ...

The key is to cast the date to number and not the number to date.

Answer 3

I was able to figure out the issue. DigCamare's comment on DATEDIFF reminded me that is what I needed to do even though you can cast a int to a smalldatetime so you can compare it.

DATEDIFF(d,L.LoanDueDate,CONVERT(smalldatetime,convert(varchar(10),(SELECT ProcessDate FROM ufnARCUGetLatestProcessDate()))))

Answer 4

Just wanted to add the following. This is what I am using to do a simple int to smalldatetime conversion. Hope it helps other people.

(SELECT CAST(CAST(ProcessDate AS VARCHAR(10)) AS SMALLDATETIME) FROM ufnARCUGetLatestProcessDate())