Wellington is 17 hours ahead of Dallas
Best overlap: 3:00 PM to 6:00 PM in Dallas is 8:00 AM to 11:00 AM in Wellington.
The sweet spot is 3:00 PM to 6:00 PM Dallas time, matching 8:00 AM to 11:00 AM in Wellington. You've got a decent 3-hour window. Set a recurring time near 3:00 PM in Dallas (8:00 AM in Wellington) and stick to it. In this window Dallas and Wellington are on different dates, with Wellington on the next day.