SQL Server : get next relative day of week. (Next Monday, Tuesday, Wed…)

Question

What I need is a date for the next given day (Monday, Tuesday, Wed...) following today\'s date.

The user is allowed to select what day following they want and that i

Answer 1

I made this as a function, in which the procedure uses available streamlined knowledge thus it's, I think, a robust solution.

CREATE FUNCTION [nilnul.time_._dated.date].[NextWeekday]
(
    @nextWeekDay int  -- sunday as firstday is 1.
)
RETURNS datetime
AS
BEGIN


declare @time datetime;
set @time=getdate();

declare @weekday int;
set @weekday = datepart(weekday,  @time) ;

declare @diff int;
set @diff= @nextWeekDay-@weekday;

--modulo 7 bijectively
declare @moduloed int;
set @moduloed = case 
    when @diff <=0 then @diff+7 
    else @diff
end;

return dateadd(day, @moduloed,  @time);

END