Entrypoint r_isleapyear compatible with UTF-8
Input INTEGER year Output INTEGER 1 = is leapyear, 0 = is no leapyear
Y2k-compatible (2000 is a leapyear). TestSQL SELECT 1 AS ISCORRECT, F_RISLEAPYEAR(2000) FROM RDB$DATABASE; SELECT NULL AS ISCORRECT, F_RISLEAPYEAR(NULL) FROM RDB$DATABASE;