SET QUOTED_IDENTIFIER ON 
GO
SET ANSI_NULLS ON 
GO
CREATE FUNCTION [dbo].[to_datetime] (@d varchar(255))
RETURNS datetime
with execute as CALLER
    AS
    BEGIN
        declare @to_datetime datetime;
		if @d is null
			return null

		if (charindex(' ', @d) = 0) 
			set @d = @d + 'T00:00:00';
		else
			set @d = replace(@d, ' ', 'T') + ':00';
		
		if isdate(@d) = 0
			return null
		set @to_datetime = convert(datetime, @d)
        return (@to_datetime);
    END
GO
SET QUOTED_IDENTIFIER OFF 
GO
SET ANSI_NULLS OFF 
GO

GO