How to convert DATETIME to FILETIME value in T-SQL?

Posted by Alek Davis on Stack Overflow See other posts from Stack Overflow or by Alek Davis
Published on 2010-05-27T19:22:47Z Indexed on 2010/05/27 19:31 UTC
Read the original article Hit count: 1005

Filed under:

datetime

|

convert

|

t-sql

|

filetime

|

transact-sql

I need to convert a SQL Server DATETIME value to FILETIME in a T-SQL SELECT statement (on SQL Server 2000). Is there a built-in function to do this? If not, can someone help me figure out how to implement this conversion routine as a UDF (or just plain Transact-SQL)? Here is what I know:

FILETIME is 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601 (UTC) (per MSDN: FILETIME Structure).
SQL Server time era starts on 1900-01-01 00:00:00 (per SELECT CAST(0 as DATETIME).

I found several examples showing how to convert FILETIME values to T-SQL DATETIME (I'm not 100% sure they are accurate, though), but could not find anything about reverse conversion. Even the general idea (or algorithm) would help.

© Stack Overflow or respective owner

Related posts about datetime

Finding begin and end of year/month/day/hour

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm using the following snipped to find the begin and end of several time periods in Joda. The little devil on my left shoulder says thats the way to go... but I dont believe him. Could anybody with some joda experience take a brief look and tell me that the little guy is right? (It will be only… >>> More
Get non-overlapping dates ranges for prices history data

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello, Let's assume that I have the following table: CREATE TABLE [dbo].[PricesHist]( [Product] varchar NOT NULL, [Price] [float] NOT NULL, [StartDate] [datetime] NOT NULL, [EndDate] [datetime] NOT NULL ) INSERT [dbo].[PricesHist] ([Product], [Price], [StartDate], [EndDate]) VALUES (N'Apples'… >>> More
DateTime.MinValue vs new DateTime() in C#

as seen on Stack Overflow - Search for 'Stack Overflow'
When getting SQL DateTime Resharper suggests to use new DateTime() when value is DBNull.Value. I've always used DateTime.MinValue. Which is the proper way? DateTime varData = sqlQueryResult["Data"] is DateTime ? (DateTime) sqlQueryResult["Data"] : new DateTime(); >>> More
SOLVED: Error 1 Ticks must be between DateTime.MinValue.Ticks and DateTime.MaxValue.Ticks

as seen on Dot net Slackers - Search for 'Dot net Slackers'
This is a simple looking error message that is deceptively hard to track down. Thankfully if you're having this problem then this article should get you back on track without spending hours scratching your head. Scenario It was time to update an existing website so after synchronising my copy of… >>> More
Converting Openfire IM datetime values in SQL Server to / from VARCHAR(15) and DATETIME data types

as seen on Geeks with Blogs - Search for 'Geeks with Blogs'
A client is using Openfire IM for their users, and would like some custom queries to audit user conversations (which are stored by Openfire in tables in the SQL Server database). Because Openfire supports multiple database servers and multiple platforms, the designers chose to store all date/time… >>> More

Related posts about convert

Monitoring SQL Server Agent job run times

as seen on SQL Blogcasts - Search for 'SQL Blogcasts'
Introduction A few months back, I was asked how long a particular nightly process took to run. It was a super question and the one thing that struck me was that there were a plethora of factors affecting the processing time. This said, I developed a query to ascertain process run times, the… >>> More
Convert Dynamic to Type and convert Type to Dynamic

as seen on Geeks with Blogs - Search for 'Geeks with Blogs'
public static class DynamicExtensions { public static T FromDynamic<T>(this IDictionary<string, object> dictionary) { var bindings = new List<MemberBinding>(); foreach (var sourceProperty in typeof(T).GetProperties().Where(x => x… >>> More
Need help in filtering the data with various condition and filling in scroll window GP

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi all, I am filtering the data and displaying in scroll window. There are many combination to display this data by customer id, customer id and itemnumber, customer id, itemnumber, work and history condition. And from date and To date condition. My query is when I am selecting the customer id and… >>> More
Convert and convert back datetime in Django

as seen on Stack Overflow - Search for 'Stack Overflow'
I am parsing feeds using feedparser and I am trying to store updated or updated_parsed attributes of feeds in Django db. But it shows an error as [u'Enter a valid date/time in YYYY-MM-DD HH:MM[:ss[.uuuuuu]] format.'] Please tell me how to convert updated and updated_parsed such that it can be stored… >>> More
Redaction in AutoVue

as seen on Oracle Blogs - Search for 'Oracle Blogs'
As the trend to digitize all paper assets continues, so does the push to digitize all the processes around these assets. One such process is redaction - removing sensitive or classified information from documents. While for some this may conjure up thoughts of old CIA documents filled with nothing… >>> More