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TODATETIMEOFFSET fails only when reading smallint offset value out of a table

Posted By:      Posted Date: October 03, 2010    Points: 0   Category :Sql Server

SQL Server 2008 R2 Developer

I'm getting a completely bizarre failure with the below repro code.  It ONLY fails in scenario #2, where I get "The timezone provided to builtin function todatetimeoffset is invalid."  I can't for the life of me understand what the difference is between scenario #2 and #3 from the function's perspective.  Once the value is assigned to the local SMALLINT variable, why does it matter where the value came from?

DECLARE	@OrgTimezoneOffset1 INT,
	@OrgTimezoneOffset2 SMALLINT,
	@OrgTimezoneOffset3 SMALLINT

CREATE TABLE dbo.Timezone (
	TimeZoneName VARCHAR(100),
	TimeZoneOffset SMALLINT

INSERT INTO dbo.Timezone
SELECT	'(UTC-07:00) Arizona',

SELECT @OrgTimezoneOffset1 = tz.TimezoneOffset
FROM dbo.Timezone tz
WHERE tz.TimezoneName = '(UTC-07:00) Arizona'

SELECT @OrgTimezoneOffset2 = tz.TimezoneOffset
FROM dbo.Timezone tz
WHERE tz.TimezoneName = '(UTC-07:00) Arizona'

SELECT @OrgTimezoneOffset3 = -420

SELECT @OrgTimezoneOffset1, @OrgTimezoneOffset2, @OrgTimezoneOffset3

--Scenario #1: INT variable, assigned from table query - works

--Scenario #2: SMALLINT variable, assigned from table query - fails

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