Remove duplicates with in 10 min, Sql Server

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--Sql Server 2014 Express Edition
--Batches are separated by 'go'

create Table Datetimetable
(
    ID int,
    Name varchar(30) ,
    DateTime1 datetime
    )
    
    Insert into Datetimetable(ID,Name,DateTime1)values(1,'Joe','2017-03-01 11:33:13');
    Insert into Datetimetable(ID,Name,DateTime1)values(1,'Joe','2017-03-01 11:33:14');
    Insert into Datetimetable(ID,Name,DateTime1)values(1,'Joe','2017-03-01 11:33:15');
    Insert into Datetimetable(ID,Name,DateTime1)values(1,'Joe','2017-03-01 11:55:30');
    Insert into Datetimetable(ID,Name,DateTime1)values(1,'John','2017-03-15 08:55:48');
    Insert into Datetimetable(ID,Name,DateTime1)values(1,'John','2017-03-15 08:55:49');
    Insert into Datetimetable(ID,Name,DateTime1)values(1,'John','2017-03-15 10:15:40');
    
   
    
    
    with cte as

(
select *,row_number() over( partition by (  CAST(CONVERT(CHAR(16), [DateTime1],113) AS datetime)) order by [Name]) as rn from Datetimetable
)
select * from cte where rn=1

select *, row_number() over ( partition by (CAST(convert(CHAR(16),DateTime1,113)AS datetime)) order by Name)  from Datetimetable
    
    SELECT  A.ID,A.NAME,A.[DATETIME1] FROM  
(SELECT *,ROW_NUMBER() OVER( PARTITION BY (  CAST(CONVERT(CHAR(16), [DATETIME1],113) AS DATETIME)) ORDER BY [NAME]) AS RN FROM Datetimetable
)A
WHERE RN=1 ORDER BY ID

View schema
Execution time: 0,02 sec, rows selected: 15, rows affected: 7, absolute service time: 0,16 sec