rt__valid_civil_p 4065 ext/date/date_core.c VALUE jd = rt__valid_civil_p(year, mon, mday, sg); rt__valid_civil_p 4150 ext/date/date_core.c jd = rt__valid_civil_p(ref_hash("year"), rt__valid_civil_p 7750 ext/date/date_core.c jd = rt__valid_civil_p(ref_hash("year"),