I don't like JASON
I like to keep my colleagues guessing by using the non-ambiguous single letter names for the months I learned in financial services: FGH JKM NQU VXZ; I feel it's wasteful to use 3 letters or two digits for just 12 months (and nobody seems to like 123456789ABC). Works nicely with the last digit of the year - this month is 7Z and next month is 8F.
I also prefer MTWRFSU for days because 1-7 has been totally ruined by the idiots who think the week starts on Sunday.
I'd better just grab the flak jacket.