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Posted 28 Dec 2003


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Convert DateTime To .NET Ticks Using T-SQL

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3.59/5 (17 votes)
28 Dec 2003
Convert a datetime value to .NET-compatible Ticks using a T-SQL User-Defined Function. Useful for interoperation between .NET and unmanaged environments such as ASP and VB6


The .NET Framework provides a simple long representation for a datetime, known as Ticks. A given ticks value is the number of 100-nanosecond intervals that have elapsed since 12:00 A.M., January 1, 0001. Unmanaged components might have to interact with .NET components using ticks. This article presents a simple T-SQL User-Defined Function for converting a datetime value to ticks.


Unmanaged languages often expose datetime values as OLE Automation dates (OADate). An OLE Automation date is implemented as a floating-point number whose value is the number of days from midnight, 30 December 1899. In 32-bit systems, a Ticks representation is higher-fidelity than an OADate representation. Consequently, a given datetime value should be converted to Ticks from within SQL Server, not unmanaged application code.

Using the code

Create the User-Defined Functions supplied with this article on a SQL Server database. Use the dbo.DateTimeToTicks function in queries, views, and stored procedures as needed.

DECLARE @TestDate datetime
SET @TestDate = GetDate()
select @TestDate, dbo.DateTimeToTicks(@TestDate)

Points Of Interest

For information on the .NET Framework DateTime structure, see here. Documentation on Ticks and OADates is here and here.


  • Release 1.0


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Written By
Web Developer
Canada Canada
I am a Senior Software Architect for Point2 Technologies, a software development company in Saskatoon, Saskatchewan, Canada.

I love .NET, SQLXML, XSLT, Web Services, Java and much more.

Comments and Discussions

QuestionGreat Article Pin
M Wasim29-Sep-16 19:12
MemberM Wasim29-Sep-16 19:12 
AnswerGeneral-purpose DateDiffInTicks and AddTicksToDateTime Pin
realbart9-Feb-12 5:42
Memberrealbart9-Feb-12 5:42 
Generali am taught that the db server should be used as data storage/retrieval and not data processor Pin
cairoso11-Jun-09 0:02
Membercairoso11-Jun-09 0:02 
GeneralPerfect Pin
GreenKnight21-May-09 9:25
MemberGreenKnight21-May-09 9:25 
GeneralMy vote of 2 Pin
villecoder16-Mar-09 12:24
Membervillecoder16-Mar-09 12:24 
GeneralRe: My vote of 2 Pin
GreenKnight21-May-09 9:27
MemberGreenKnight21-May-09 9:27 
GeneralTicks to DateTime Pin
Ricardo Casquete19-Nov-08 19:33
MemberRicardo Casquete19-Nov-08 19:33 
GeneralOther idea for Ticks Pin
cool_greg21-Apr-08 0:14
Membercool_greg21-Apr-08 0:14 
GeneralRe: Other idea for Ticks Pin
crazsmith8-Jul-09 7:47
Membercrazsmith8-Jul-09 7:47 
Generalconvert ticks to DateTime Pin
nmrs212-Jan-04 4:04
Membernmrs212-Jan-04 4:04 
GeneralRe: convert ticks to DateTime Pin
Guido_d14-Jul-06 3:43
MemberGuido_d14-Jul-06 3:43 

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