-- =============================================
-- Author:		Dr. Stefan Ott
-- Create date: <Create Date, ,>
-- Description:	<Description, ,>
-- =============================================
CREATE FUNCTION [dbo].[datetime_LocalToUTC]
(
	@datetime datetime
	,@timezone varchar(50) = null
)
RETURNS datetime
AS
BEGIN
	DECLARE @Ret datetime;

	IF @datetime is null
		SET @RET = null;
	ELSE
		SET @RET = @datetime AT TIME ZONE ISNULL(@timezone, 'Central European Standard Time') AT TIME ZONE 'UTC'

	RETURN @RET;

END