Eulalio Do Nascimento e Silva, Geraldo Keywords: Time | Law of treaties | Vienna Convention on the Law of Treaties (Vienna, 23 May 1969) | Mots clefs: Temps | Droit des traités | Convention de Vienne sur le droit des traités (Vienne, 23 mai 1969) | ABSTRACT Geraldo Eulalio Do Nascimento E Silva, Ambassador of Brazil, deals with three topics on which the time factor has the greatest influence: entry into force of the treaty; successive treaties dealing with the same matter; and the inter-temporal law of treaties, including the problem of non-retro-activity. Le cours de Geraldo Eulalio Do…