SSRS Active Directory Data Source LastLogonTimeStamp returns "System._ComObject"

Question

I am working in Report Builder and I have created a Data Source Connection to my Active Directory. I want to get LastLogonTimeStamp from my AD computer objects but when i run the query i get "System._ComObject" instead of a date. All the other
fields return data.
here is my code:
SELECT ADsPath, cn ,objectCategory,name, lastLogonTimestamp
FROM 'LDAP://DC=domain,DC=org'
where objectCategory = 'Computer'
Eventually i would like a query that returns a count of Computer objects where LastLogonTimeStamp is older than 30 days.
I have researched this and found that the LastLogonTimeStamp is a IADsLargeInteger
Value and not an actual date. How can i display this as a date is SSRS Report Builder

Answer 1

Hi Ryaed,
The lastLogon and lastLogonTimestamp LDAP timestamps attributes are returned in int64 format (also called Windows NT time format) and the timestamp is the number of 100-nanoseconds intervals (1 nanosecond = one billionth of a second) since Jan 1, 1601 UTC.
So, we cannot tell the exact date and time directly. To convert the Windows NT time format value to human readable date value, you can use the following query:
SELECT ADsPath, cn ,objectCategory,name, DATEADD(Minute,(lastLogonTimeStamp/ 600000000) + DATEDIFF(Minute,GetUTCDate(),GetDate()),CAST('1/1/1601' AS DATETIME2))
FROM 'LDAP://DC=domain,DC=org'
WHERE objectCategory = 'Computer'
Or you can also create a user defined function:
CREATE FUNCTION dbo.udf_Int8_to_DateTime(
@Int8 BIGINT
RETURNS DATETIME2
AS
BEGIN
RETURN (DATEADD(Minute,@Int8 / 600000000 + DATEDIFF(Minute,GetUTCDate(),GetDate()),CAST('1/1/1601' AS DATETIME2)))
END
Then, use the function in the query like below:
SELECT ADsPath, cn ,objectCategory,name, udf_Int8_to_DateTime(lastLogonTimestamp)
FROM 'LDAP://DC=domain,DC=org'
WHERE objectCategory = 'Computer'
Reference:
http://myitforum.com/cs2/blogs/jnelson/archive/2009/08/25/140938.aspx
Regards,
Mike Yin
TechNet Community Support