I always loved the fact that my grandfather's parents, Lowell Copeland and Ethel May Greeley, were married on January 1, 1900. And I was especially excited when I was able to confirm this by finding their marriage license at FamilySearch.org in Winnetka, Cook County, Illinois:
Christ Church Winnetka by Rev. Henry Grattan Moore. Note that at the bottom of the license, where the pre-printed date was 189_, he had to completely write over it: 1900.
(N.B. My grandfather, Lowell Townsend Copeland, was born just under a year later, on December 21, 1900.)