Ottawa is 16 hours behind Melbourne
Best overlap: 8:00 AM to 10:00 AM in Melbourne is 4:00 PM to 6:00 PM in Ottawa.
For the smoothest call, aim inside 8:00 AM to 10:00 AM in Melbourne, i.e. 4:00 PM to 6:00 PM in Ottawa. Overlap is at a premium — roughly 2 hours — so claim 8:00 AM in Melbourne (4:00 PM in Ottawa) for recurring calls and keep them on time. Mind the calendar: when you pick a time, Ottawa will be on the previous day compared with Melbourne.