18Trois ans plus tard, je montai à Jérusalem pour faire la connaissance de Céphas, et je demeurai quinze jours chez lui.
Paul is referring to three years after his conversion/meeting with Jesus Christ on the road to Damascus. It is not clear if this were three full years, since Jewish counting was inclusive at the time.1 If his conversion was in 31/32 AD, then his visit to Peter in Jerusalem took place in 33/34 AD.2
18 Trois ans plus tard, je montai à Jérusalem pour faire la connaissance de Céphas, et je demeurai quinze jours chez lui.