CREATE FUNCTION [dbo].[get_date_only] (@date datetime)
RETURNS datetime AS
BEGIN
	RETURN dateadd(day, DateDiff(day, 0, GetDate()), 0)
END

CREATE FUNCTION [dbo].[get_month_end] (@date datetime)
RETURNS datetime AS
BEGIN
   RETURN dateadd(ms, -3, dateadd (m,datediff(m,0,
          dateadd(m,1,@date)),0))
END

CREATE FUNCTION [dbo].[get_month_start] (@date datetime)
RETURNS datetime AS
BEGIN
   RETURN dateadd(m,datediff(m,0, @date),0)
   END

CREATE FUNCTION [dbo].[get_today_end] (@today datetime)
RETURNS datetime AS
BEGIN
   return dateadd(ms, -3, datediff(d,0,dateadd(d,1,@today)))
END

CREATE FUNCTION [dbo].[get_today_noon](@date datetime)
RETURNS datetime
BEGIN
   RETURN DATEADD(hh, 12, DATEADD(d,DATEDIFF(d,0, @date),0))
END

CREATE FUNCTION [dbo].[get_today_start] (@today datetime)
RETURNS datetime AS
BEGIN
   return dateadd(day, 0, datediff(d,0,@today))
END

CREATE FUNCTION [dbo].[get_tomorrow_noon](@date datetime)
RETURNS datetime
BEGIN
   RETURN DATEADD(hh, 12, DATEADD(d,DATEDIFF(d,-1, @date),0))
END

CREATE FUNCTION [dbo].[get_week_end] (@date datetime)
RETURNS datetime AS
BEGIN
   return dateadd(yyyy, datepart(yyyy,
      dateadd(weekday,7-datepart(weekday, @date),@date))-1900, 0)
    + dateadd(ms, -3,
      dateadd(dy, datepart(dy,
     dateadd(weekday,7-datepart(weekday, @date),@date)),0) )
END

CREATE FUNCTION [dbo].[get_week_start] (@date datetime)
RETURNS datetime AS
BEGIN
   return dateadd(yyyy, datepart(yyyy,
      dateadd(weekday,1-datepart(weekday, @date),@date))-1900, 0)
    + dateadd(dy, datepart(dy,
      dateadd(weekday,1-datepart(weekday, @date),@date))-1,0)
END

CREATE FUNCTION [dbo].[get_weekday_end] (@weekday tinyint,
                                 @date datetime)
RETURNS datetime AS
BEGIN
   return dateadd(yyyy, datepart(yyyy,
      dateadd(weekday,@weekday-
      datepart(weekday, @date),@date))-1900, 0)
    + dateadd(ms, -3,
      dateadd(dy, datepart(dy,
      dateadd(weekday,@weekday-datepart(weekday, @date),
                                        @date)),0) )
END

CREATE FUNCTION [dbo].[get_weekday_start] (@weekday tinyint,
                                   @date datetime)
RETURNS datetime AS
BEGIN
   return dateadd(yyyy, datepart(yyyy,
      dateadd(weekday,@weekday-
      datepart(weekday, @date),@date))-1900, 0)
    + dateadd(dy, datepart(dy,
      dateadd(weekday,@weekday-datepart(weekday, @date),
                                        @date))-1,0)
END

CREATE FUNCTION [dbo].[get_year_start] (@date datetime)
RETURNS datetime AS
BEGIN
   RETURN DATEADD(year,DATEDIFF(year,0, @date),0)
END

CREATE FUNCTION [dbo].[get_yesterday_end] (@today datetime)
RETURNS datetime AS
BEGIN
   return dateadd(ms, -3, datediff(d,0,@today))
END

CREATE FUNCTION [dbo].[get_yesterday_start] (@today datetime)
RETURNS datetime AS
BEGIN
   RETURN dateadd(day, -1, datediff(d,0,@today))
END

CREATE FUNCTION [dbo].[udfCommonDates] (@date datetime)
RETURNS @t table (week_start datetime,
                  week_end datetime,
                  lastweek_start datetime,
                  lastweek_end datetime,
                  month_start datetime,
                  month_end datetime,
                  lastmonth_start datetime,
                  lastmonth_end datetime,
                  yesterday_start datetime,
                  yesterday_end datetime,
                  today_start datetime,
                  today_end datetime,
                  thisweek_monday_start datetime,
                  thisweek_monday_end datetime,
                  year_start datetime,
				  year_end datetime,
                  tomorrow_noon datetime,
                  today_noon datetime,
				  date_only datetime)
BEGIN
   INSERT @t
   SELECT
   dbo.get_week_start ( @date ) AS week_start,
   dbo.get_week_end   ( @date ) AS week_end,
   dbo.get_week_start ( DATEADD(d, -7, @date ) ) AS lastweek_start,
   dbo.get_week_end   ( DATEADD(d, -7, @date ) ) AS lastweek_end,
   dbo.get_month_start( @date ) AS month_start,
   dbo.get_month_end  ( @date ) AS month_end,
   dbo.get_month_start ( DATEADD(m,-1, @date) ) AS lastmonth_start,
   dbo.get_month_end  ( DATEADD(m,-1,@date) ) AS lastmonth_end,
   dbo.get_yesterday_start ( @date ) AS yesterday_start,
   dbo.get_yesterday_end ( @date ) AS yesterday_end,
   dbo.get_today_start (@date) AS today_start,
   dbo.get_today_end ( @date ) AS today_end,
   dbo.get_weekday_start(1,@date) AS thisweek_monday_start,
   dbo.get_weekday_end(1,@date) AS thisweek_monday_end,
   dbo.get_year_start(@date) AS year_start,
   dbo.get_year_end(@date) AS year_end,	 
   dbo.get_tomorrow_noon(@date) AS TomorrowNoon,
   dbo.get_today_noon(@date) AS TodayNoon,
   dbo.get_date_only(@date) AS DateOnly
RETURN
END

CREATE PROCEDURE [dbo].[uspCommonDates] AS
begin
   set datefirst 1
   declare @date datetime
   set @date = getdate()
   select * from dbo.udfCommonDates(@date)
end