ah yes, but the system does not interpret the input using the custom format rules:
I set custom date format=5Jan14
(Note that when the file is Shared, I cannot edit Custom Formats! I had to unshare it first!)
The display works fine.
But evidently it only maintains that date format if I input new date values in a "standard" date format such as 1/5/14 .
If I actually type in "5Jan14" the system interprets that as Automatic.
Thus, better to specify that the Custom Format applies only to the output (display), not the input.
Unfortunate that there is not a standard military-style short date format such as dd-MMM-yy or ddMMMyy . The all-numeric formats are readily misinterpreted (mm/dd/yy or dd/mm/yy) or strange looking yyyy-mm-dd.
(Yes, I know the Swedes use yyyymmdd all the time. Difficult to change old 'merican habits.)