Then you understand what day it’s, if a Mean Girls fan you.

It’s Oct. 3, the same day Aaron Samuels turned to Cady Heron in math course and asked for the date.

The day has since been dubbed Mean Girls Day, and a number of the cast members are commemorating the big event on social websites.

Lindsay Lohan, Jonathan Bennett, and Daniel Franzese all tweeted in celebration.

“it is October 3rd FYI,” Lohan wrote on Instagram, while Bennett tweeted that his “Telephone is blowing up.”

as well as posting a “Then and now-ish” photo on Instagram, he also recorded a special message for the ABC Family Twitter feed, ending with his famous one-liner: “You go, Glen Coco!” Mean Girls is set to air on the network Saturday at 6:45 p.m. ET. Tina Fey, Rachel McAdams, Amanda Seyfried, Lacey Chabert, and Lizzy Caplan haven’t posted anything yet, but the day is not old.