The newly enacted law must be promulgated within 30 days from the date on which the leader of the House that examined the bill second submits it to the Emperor via the Cabinet. As to the promulgation, it is done after a Cabinet decision to do so, and by publication in an official gazette . Promulgation is to ensure that a newly enacted law becomes widely known by the public. In other words, it is an act whereby the people is enabled to know the law. A law must be promulgated before it actually takes effect.
Laws usually stipulate in their attached clauses when they come into effect.
When a law is promulgated, it is given a serial number and signed by both the state minister responsible for the law and the Prime Minister.