Skinning a cat innit:
SELECT [DateOnly] = CAST(FLOOR(CAST(GETDATE() AS FLOAT)) AS DATETIME) -- CAST / FLOOR / CAST
SELECT [DateOnly] = dateadd(dd,datediff(dd, 0, getdate()), 0) -- DATEADD / DATEDIFF
SELECT [DateOnly] = CAST(CAST(GETDATE() AS INT) AS DATETIME) -- CAST / CAST
SELECT [DateOnly] = CAST(CONVERT(CHAR(8), GETDATE(), 112) AS DATETIME) -- CAST / CONVERT
For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden