Well, I don't know how long it takes for Goose eggs to hatch, but Chickens and Guineas about 21 days, Peafowl 28 days, If it was me I would start them when they were set. Some others may start with the full day.
Setting eggs is day 0, an hour later you are 1 hour into day 1. So if you say your eggs are day 19 they are finished day 18 and into day 19. They take 21 days, for chickens, so they should hatch anywhere during day 21 or day 22. Some go earlier, some later. But the days remain counted the same way. I set mine at midnight to avoid confusion.