Abstract: A utility with which a programmer can generate or alter computer code for a calendaring function, and test the code prior to compilation. Entering the program in edit mode, the programmer locates a portion of the program where code for a calendaring function is to be generated or altered, and invokes the date logic generator. The date logic generator provides an initial window with a choice of calendaring functions, and upon selecting a calendaring function, a parameters window displaying a number of first-level parameters for that function is provided. Depending on the specification of the values of the first-level parameters, sub-windows with second-level parameters may be provided. And, in general, depending on the specification of the values of the n-level parameters, (n+1)-level parameters may be provided in sub-windows. The parameters provided at any instant are only those which have already been specified or those that require specification.

Abstract: Conversion of Gregorian calendar dates to dates of a 360-day-year calendar (i.e., a calendar having twelve months of 30 days each), and 360-day-year calendar dates to Gregorian calendar dates, are performed using a single three-column 367-entry conversion table. A search table unit searches the conversion table from the bottom upwards, i.e., a table search index is initialized to a value of 367, and decremented by unity each time a comparison is made and a match is not found. A first field in each row of the conversion table contains Gregorian leap year calendar days-of-the-year, a second field in each row contains Gregorian non-leap year calendar days-of-the-year, and a third field in each row contains 360-day-year calendar days-of-the-year. A graph of Gregorian days-of-the-year versus 360-day-year days-of-the-year has both vertical and horizontal sections.

Abstract: A calendaring system which provides accurate calendaring of all dates between Jan. 01, 0001 and Dec. 31, 9999 by implementation of an extended set of leap-year rules. The system includes a variety of additional useful features including: multiple holiday tables; flexible date formats; free form definition of processing days; full support for fiscal calendaring units; changeable endpoint counting modes; and integrated support for the current date in date calendaring calculations.