I found the answer on the CIC web; . m% I+ p( X$ f) [: }0 N& U1 ~"The certificate must have been issued no more than three months before you submit your application"+ d4 [/ T, Y+ w u4 `) _
' [# \# p- X7 L' s p4 j5 d4 `9 g+ [! iOurs were more than one year when we applied.