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Convert DateTime To .NET Ticks Using T-SQL

, 28 Dec 2003
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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


This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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About the Author

Eron Wright
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.

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Comments and Discussions

AnswerGeneral-purpose DateDiffInTicks and AddTicksToDateTime Pin
realbart9-Feb-12 5:42
memberrealbart9-Feb-12 5:42 

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