It's both. It's pretty much a holiday on april 20th, but 4:20 pm is also smoke a bowl time. I wonder what time zone it originated in. Maybe 4:20 here should actually be 11:20 somewhere else. It would make more sense if everyone united in their ganja praising. I say we start a 4:20 in one time zone, and have everyone change the time according to time zone. Hmmm...