It might be useful for Prime Minister Stephen Harper to read a U.S. State Department cable from Israel released by Wikileaks. It reveals that talk of Iran's imminent production of nuclear weapons goes back to the early 1990s: "The head of the MFA's [Ministry of Foreign Affairs] strategic affairs division recalled that GOI [Government of Israel] assessments from 1993 predicted that Iran would possess an atomic bomb by 1998 at the latest."
The March 2005 cable to Washington cautioned that Israel's estimates of Iranian nuclear capability "...need to be taken with caution."