Didn't we go over this last year?
National Ammo Day is November 19th!
In case anybody does not remember, or never knew, Kim Du Toit (Dew Twah - it's Belgian) started it years ago when he had his "Front Page" blog going.
You can go find all the other verifications of who started it and when the proper day is.
That being said, I am in favor of folks buying ammo as many days as they can. You can never have enough ammo, or enough fun. (Think there is a CW song there somewhere.)