Artikel 12

1. The Convention shall enter into force 12 months after the date on which not less than 15 States have either signed it without reservation as to ratification, acceptance, or approval, or have deposited the requisite instruments of ratification, acceptance, approval or accession in accordance with article 11.
2. For States which have deposited an instrument of ratification, acceptance, approval or accession in respect of the Convention after the requirements for entry into force thereof have been met but prior to the date of entry into force, the ratification, acceptance, approval or accession shall take effect on the date of entry into force of the Convention or three months after the date of deposit of the instrument, whichever is the later date.
3. For States which have deposited an instrument of ratification, acceptance, approval or accession after the date on which the Convention entered into force, the Convention shall become effective three months after the date of deposit of the instrument.
4. After the date on which an amendment to the Convention is deemed to have been accepted under article 10, any instrument of ratification, acceptance, approval or accession deposited shall apply to the Convention as amended.