The allensdk should be organized differently, with the sdk primarily residing within the allensdk folder in the parent folder. I believe that the original commit by myself was done incorrectly, resulting in folder such as brain observatory existing in the parent folder.
Inspecting an NWB file using hdf5view shows field session_start_time and file_create_date.
Both are equals while the session_start_time should be set to the day of the experiment