Updating wrong Date value in the database at the time of posting from microstation

Hi,

We have a problem with taking wrong date value (The date varying between the system date and Set property date which has written in the Microstation c# code) in the database at the time of posting from Microstation. 

We are using Bentley Map Enterprises v8i SS3 and registered features using Bentley Geo Spatial Administrator. Below image shows the registered  date format field from GSA.

We have opened DGN with Oracle spatial connection once registration has done .After that we placed registered feature and posted successfully. Below are the C# code for set the property of a feature.

 objxftfeature.SetProperty("QA_DATE",DateTime.Now.tostring());

After posting we have observed in the properties, date field value shows as "Input string was not in a correct format."


Date field Values are stored in the database as shown in below snap shot.

But my system shows the date & time as 2/22/2013 12:02:15 PM.
Could you please help me out  this problem. Thanks in advance.

Regards
Rama Krishna