[log in to unmask] quoted and then wrote: >By limiting the year range to 1901 .. 2099, Ada sidestepped >the issue of years evenly divisible by 4 that are not leap >years. 1900, and 2100 are both evenly divisible by 4, but not >leap years. It is possible to change the Ada standard in the forward direction and require implementors to handle the leap year math correctly. It is not possible to change the Ada standard in a uniform and useful manner in the backward direction because of all the diversity of how the calendar works according to the political decisions in various jurisdictions. There are 11 days missing from 1752, depending on your religion and citizenship.