I can certainly add my information to your database if there is some place that I can enter them. Though I think that we should follow the setup that was done by Michael Denny on the Peony Bloom Date Project.
http://peonybloomdate.com/. He used Red Charm bloom date as being 0. And then any flowers that bloom before Red Charm is recorded as a minus number of days it blooms before Red Charm. And any peony that blooms after Red Charm, it is recorded as a positive number of days it blooms after Red Charm. For example, let's say Roselette blooms 15 days before Red Charm, then it would be recorded as -15. Let's say Elsa Sass blooms 10 days after Red Charm, it would be recorded as +10.
