摘要：The article examines the constitutional status of the lex mitior-principle (retroactive application of the milder criminal law). This review provides a frame work for the analysis of a judgment of the Chilean Constitutional Court regarding a case arised by the application of a saving provision of the reform of chilean Bankruptcy law. The problema examined is the determination of the margin of legislative discretion left by the constitutional entrenchment of the principle.
关键词：Time and law;lex mitior: retrospective application of the milder law;legality;saving provision;reform of chilean bankruptcy law: Act 20.720;Aplicabilidad temporal de la ley penal;principio de lex mitior: retroactividad de la ley penal más favorable;principio de legalidad;derecho transitorio;reforma del derecho concursal chileno: Ley 20.720
