All transcription errors. The same story, also by Corsi, is on World Net Daily, with a copy of Stanley Ann's transcript from the University of Washington.
From that image, even if one expands it a bit, it's a little hard to tell if the class start date is 8/19/61 or 9/19/61. However 8/19/61 was a Saturday, an odd day for classes to start..unless it was a Saturday class, possible for an extension class, which is what the transcript shows it was. OTOH, 9/19/61 was a Tuesday. Also an unusual day for classes to start.
I checked the *regular*, not extension class, start dates for U. Washington for 2000/1/2/3/4/5/7/8/9 0,1,2,3 classes started on Monday. 4,5,6,7,8,9 they started or will start. on Wednesday. No Tuesdays, but all are in late September, except one which was October 1.
For the extension courses, I could only find the start dates for 2009, which is September 30 for "most classes". The classes Stanley Ann took are listed as extension, not correspondence, which would probably mean they would be evening or weekend classes.