[This is preliminary documentation and subject to change.]
The GlobalStartTime method retrieves the date and time of the earliest start time of any episode in the Guide database.
HRESULT GlobalStartTime(
  DATE *pdate  
);
 Returns an HRESULT indicating success or failure. If the method succeeds it returns S_OK. Otherwise it returns an error code. For specific error code values see Winerror.h.
  Windows NT: Unsupported.
  Windows: Requires Windows 98.
  Windows CE: Unsupported.
  Header: Declared in tvdisp.odl.
  Import Library: Included as a resource in tvx.exe.
  Unicode: Yes.