-- =============================================
-- Author:		<Author,,Name>
-- Create date: <Create Date, ,>
-- Description:	<Description, ,>
-- =============================================
CREATE FUNCTION [dbo].[date_monthfirst]
(
	@date date
)
RETURNS date
AS
BEGIN
	DECLARE @monthfirst date = CASE WHEN @date is null THEN NULL ELSE DATEFROMPARTS(YEAR(@date), MONTH(@date), 1) END;

	return @monthfirst;
END