<PRIVATE
: check-month ( n -- n )
- [ not-a-month ] when-zero ;
+ [ throw-not-a-month ] when-zero ;
PRIVATE>
: month-abbreviation-index ( string -- n )
month-abbreviations-hash ?at
- [ not-a-month-abbreviation ] unless ;
+ [ throw-not-a-month-abbreviation ] unless ;
CONSTANT: day-counts { 0 31 28 31 30 31 30 31 31 30 31 30 31 }