Abu Dhabi is 9 hours ahead of Medellín
Best overlap: 8:00 AM to 9:00 AM in Medellín is 5:00 PM to 6:00 PM in Abu Dhabi.
For the smoothest call, aim inside 8:00 AM to 9:00 AM in Medellín, i.e. 5:00 PM to 6:00 PM in Abu Dhabi. Overlap is at a premium — roughly 1 hour — so claim 8:00 AM in Medellín (5:00 PM in Abu Dhabi) for recurring calls and keep them on time.