SQL time stamp to millisecond

Question

How can I convert SQL time using a datetime stamp to milliseconds. I am doing a highstock chart using VB.Net

and this is my selection code so far

    Dim mydatalist As New List(Of XyData)
    Dim sqlReader As SqlDataReader
    Dim strConn As New     SqlConnection(ConfigurationManager.ConnectionStrings("myCipConnection").ConnectionString)
    Dim strSql As String = "SELECT TOP 1000 DATEDIFF(second,{d '1970-01-  01'},dtmStamp)AS dtmStamp  ,dblReturnTemp  FROM tblCIPEventData  "
    Dim sqlCmd As New SqlCommand(strSql, strConn)
    strConn.Open()
    sqlReader = sqlCmd.ExecuteReader

I have a SQL selection

Dim strSql As String = "SELECT TOP 1 dtmStamp ,dblReturnTemp   FROM tblCIPEventData"

The result looks like

2009-10-22 11:29:31.513

How can I convert this to milliseconds

Answer 1

http://support.microsoft.com/kb/186265

You can use the SQL Server DATEPART() function to get the milliseconds of a SQL Server datetime field returned to a Visual Basic application.

Example:

SELECT Pubdate, DATEPART(Ms, Pubdate) FROM Titles

Answer 2

For work we did using a timestamp that was in the form of DATETIME we did the following because we were not concerned with the time of day:

CONVERT(BIGINT, DATEDIFF(s, '19700101', left(a.mdate, 11)))*1000

The left(a.mdate, 11) gives data like = Apr 25 2012 (in readable format)

a.mdate = 2012-04-25 11:01:18.030

This is in the javascript time needed.

Answer 3

To figure out the milliseconds of a date you first have to compare it to some other DateTime. By subtracting two DateTime objects you will end up with a TimeSpan object. Then that TimeSpan object can be converted to milliseconds. This can all be done with one simple line of code:

Dim milliseconds As Double
milliseconds = (end - start).TotalMilliseconds

Answer 4

If you want to do it SQL you can just use Robert Harvey's answer

If you want to it in VB.NET and you have the following

Dim strSql As String = "SELECT TOP 1 dtmStamp ,dblReturnTemp   FROM tblCIPEventData"

The result will be a System.DateTime

To answer the question How can I convert this to milliseconds? we can make use of TimeSpan

Dim dtmStamp as DateTime
dtmStamp = sqlReader.GetDateTime(0)

Dim ts As New TimeSpan(dtmStamp.Ticks)
Dim milliseconds as Long  
milliseconds = TotalMilliseconds 

This will give you the number of Milliseconds since 1/1/0001 12:00 AM

If you want the epoch to be 01/01/1970 you just do

Dim epoch as DateTime  = new DateTime(1970,1,1)
Dim ts As New TimeSpan((dtmStamp - epoch).Ticks)

Answer 5

This did the job for me:

me.labelDisplay.Text = CDate(query.dateColumn).ToString("yyyy-MM-dd HH:mm:ss.fff")

Output:

2017-03-23 16:35:08.237 

In case you want to get the milliseconds part use:

Dim ms as Integer = CDate(query.dateColumn).Milliseconds()