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How to combine date and time into datetime?

Execute the following Microsoft SQL Server T-SQL scripts in Management Studio Query Editor to demonstrate the combination of date and time.

-- Using the + operator

DECLARE @Date datetime = '2016-10-23', @Time datetime = '1900-01-01 12:15:44';

SELECT CombinedDatetime = @Date+@Time;

-- 2016-10-23 12:15:44.000

------------

The fnCombineDateTime UDF (scalar-valued user-defined function) combines string date and time into a datetime result:

USE AdventureWorks;

GO

-- SQL create function to combine data and time into datetime

CREATE FUNCTION fnCombineDateTime (@Date char(8), @Time char(6))

RETURNS datetime

AS

      BEGIN

      DECLARE @DateTime datetime

      SELECT @DateTime=CONVERT(datetime, @Date + ' ' +

                       STUFF(STUFF(@Time, 3, 0, ':'), 6, 0, ':'))

RETURN @DateTime

END

GO

 

-- Test string to datetime conversion

DECLARE @Date char(8), @Time char(6)

SET @Date='20121225'

SET @Time='094400'

 

SELECT [Date Time] = dbo.fnCombineDateTime (@Date, @Time)

GO

/* Result

 

Date Time

2012-12-25 09:44:00.000

*/

-------------

 

-------------

-- SQL Server 2008 Combine Date and Time (7) into datetime2(7)

-------------

USE AdventureWorks2008;

DECLARE  @Date  DATE,

         @Time  TIME(7),

         @Date7 DATETIME2(7)

 

SELECT @Date = CONVERT(VARCHAR,GETDATE(),112),

       @Time = '20:30:40.9876543'

-- Map to 1900-01-01

SET @Date7 = @Time

 

SELECT Date7=@Date7, [Date]=@Date,

Combination=DATEAdd(DAY,datediff(DAY,@Date7,@Date),@Date7)

/*

Date7                         Date        Combination

1900-01-01 20:30:40.9876543   2012-07-31  2012-07-31 20:30:40.9876543

*/

------------

Related articles:

http://www.sqlusa.com/bestpractices/datetimeconversion/

How to combine date from one field with time from another field - MS SQL Server

 

 

Exam Prep 70-461
Exam 70-461