Can new laws be retroactive

Generally, new laws are not retroactive unless explicitly stated. Retroactive laws, which apply to events that occurred before the law was enacted, can raise legal and ethical concerns, particularly regarding fairness and due process. In many jurisdictions, the principle of legality requires that individuals know what the law is before being held accountable for it. However, some laws, particularly in the realm of civil law, may be applied retroactively if they are deemed beneficial or corrective.