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SQL Server FAQ - Setting New Values to Parts of a DATETIME Value

By: FYIcenter.com

(Continued from previous topic...)

How To Set Different Parts of a DATETIME Value?

In SQL Server, you can get different parts of a DATETIME value with the DATEPART() functions. But there is no function that allows you to set different parts to a DATETIME value. For example, you a date_of_birth column as DATETIME in a table, you want to set all rows to the noon time in this column.

The tutorial exercise below shows how to set year, month, day, hour, minute and second to any give DATETIME value:

-- set parts to a DATETIME value DECLARE @date_of_birth DATETIME; SET @date_of_birth = GETDATE(); SET @date_of_birth = DATEADD(YEAR, 1987-DATEPART(YEAR,@date_of_birth), @date_of_birth); SET @date_of_birth = DATEADD(MONTH, 05-DATEPART(MONTH,@date_of_birth), @date_of_birth); SET @date_of_birth = DATEADD(DAY, 19-DATEPART(DAY,@date_of_birth), @date_of_birth); SET @date_of_birth = DATEADD(HOUR, 12-DATEPART(HOUR,@date_of_birth), @date_of_birth); SET @date_of_birth = DATEADD(MINUTE, 00-DATEPART(MINUTE,@date_of_birth), @date_of_birth); SET @date_of_birth = DATEADD(SECOND, 00-DATEPART(SECOND,@date_of_birth), @date_of_birth); SELECT 'You were born on ' + CONVERT(VARCHAR(40),@date_of_birth,107) + ', at ' + CONVERT(VARCHAR(40),@date_of_birth,108); GO You were born on May 19, 1987, at 12:00:00

  1. How To Add or Remove Days on Date and Time Values?
  2. Can Date and Time Values Be Converted into Integers?
  3. Can Integers Be Converted into Date and Time Values?
  4. Are DATETIME and NUMERIC Values Convertible?
  5. Can a DATETIME Value Be Subtracted from Another DATETIME Value?
  6. What Are the Date and Time Functions Supported by SQL Server 2005?
  7. How To Increment or Decrement Parts of DATETIME Values?
  8. How To Use DATEADD() Function?
  9. How To Calculate DATETIME Value Differences Using the DATEDIFF() Function?
  10. How To Calculate Age in Days, Hours and Minutes?
  11. How To Get Month and Weekday Names from DATETIME Values?
  12. How To Get Parts of DATETIME Values as Integers?
  13. How To Get Year, Month and Day Out of DATETIME Values?
  14. What Is the Difference Between GETDATE() and GETUTCDATE()?
  15. How To Format Time Zone in +/-hh:mm Format?
  16. How To Format DATETIME Values to Strings with the CONVERT() Function?
  17. How To Truncate DATETIME Values to Dates without Time?
  18. How To Set Different Parts of a DATETIME Value?

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