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1. This Convention shall enter into force twelve months after the date on which not less than fifteen 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 15.
2. For States which have deposited an instrument of ratification, acceptance, approval or accession in respect of this 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 this 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 this Convention entered into force, this Convention shall become effective three months after the date of deposit of the instrument.
4. After the date on which an amendment to this Convention is deemed to have been accepted under article 14, any instrument of ratification, acceptance, approval or accession deposited shall apply to this Convention as amended.