February 12, 1921 is a date featured in the Season 2 episode "21". Events of the day include:
- Rose Van Alden visits her husband Nelson in Atlantic City.
- The Commodore makes his first move against Nucky by supporting a Ku Klux Klan assassination attempt against Chalky White. While the KKK fails to kill him, Chalky is arrested after killing klansman Herman Dacus in retaliation, putting his distillery out of work.
- Margaret Schroeder discovers that her son Teddy is a pyromaniac.
- George Remus becomes the new provider of alcohol to Johnny Torrio.
- Nucky, Mayor Bader and the ward bosses lay a plan to gain millions through speculating with New Jersey farmland linked to the road appropriation bill. Irish businessman Ernie Moran is hired to provide the gravel.