....Yesterday, new details emerged yesterday about al Muhajir's(Jose Pedilla) life in the United States, including his conversion from Roman Catholicism to Islam in the mid-1990s. The leader of the Darul Uloom Institute, a school in Pembroke Pines, Fla., where al Muhajir studied Islam in 1995, described him as an extremely observant Muslim who stood out at the relatively liberal facility.....Darul Uloom Institute was one of the places where he attended Saturday morning courses in 1995.... Al Muhajir used the name "Ibrahim" during the three to six months that he attended, Mohamed said; the name also appears on marriage records. "He used to come, but he just disappeared. I am so baffled," he said. "He was a very quiet, quiet guy."
More digging should be able to pin that 3-6 months down to the specific months involved.