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When trying to solve a logic puzzle, I ran across the following issue - October 30, 2166 seems not to exist!
?- form_time(gregorian(2166, 10, 29)).
true.
?- form_time(gregorian(2166, 10, 30)).
false.
?- form_time(gregorian(2166, 10, 31)).
true.
However, the following works:
?- gregorian(2166, 10, 30).
Correct to: "julian_calendar_gregorian:gregorian(2166,10,30)"? yes
true.
Version: SWI-Prolog (threaded, 64 bits, version 8.0.1)
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