Find all the versions created time of a document in a document library

  for (int i = 0; i < objSPFileVersionCollection.Count; i++)
{
 SPFileVersion objSPFileVersion = objSPFileVersionCollection[i];                        
 string Createdtime= objSPFileVersion.Created.ToString(); 

}

But the value i am getting in "Createdtime" is not correct...
am i missing anything?
pls help