Hi
It always depends on the overseas crime. If there is no comparison to a Canadian offense then it is not considered a crime in Canada. Although CHC/CIC can and will equate it to a Canadian offense if that is possible. An example would be blasphemy which is an offense in a number of countries, but there is no Canadian equivalent, so the person would not be inadmissible.
The way I read the OP's question was that at the time the offence occurred, it was not considered a crime in Canada. But perhaps now it is? Anyway, it seemed to me that they were asking if it would be compared to the CCC that was in place at the time the crime was committed outside of Canada or now, to the current CCC when assessing the immigrant application. I'm thinking the comparison would be to the current CCC, not the one in effect at the time of the offence. Is that correct?