My parents have a single entry visitor visa approved for six months till June 18th. Now i want to know if this date means that they have to enter canada before June 18th or leave canada by June 18th. I am planning to bring them by April 15th and want to have them till Aug 15th. Will that mean i might have to apply for an extension while they are here or is it a simple 6months valid stay from the date of entry ? Also is there a number to reach a live person in the immigration services to ask abt this ? Its all recorded messages everywhere...