Question: When was the band that made De RigueurMortis formed?

Related documents: [0]  [DOC] De RigueurMortis (stylised as "De Rigueur"Mortis) is a 2001 album by Australian alternative-rock group TISM. Initial copies of this release, dubbed the Connoisseur's Edition, included several untitled tracks and a bonus CD titled "2Pot Screama", a 41-minute "rock opera in one act" which TISM described as "West Side Story with Tourette's syndrome". [END] 
[1]  [DOC] TISM (an acronym of This Is Serious Mum) were a seven-piece anonymous alternative rock band from Melbourne, Australia. The group were formed on 30 December 1982 by vocalist/drummer Humphrey B. Flaubert, bassist/vocalist Jock Cheese and keyboardist/vocalist Eugene de la Hot Croix Bun, and enjoyed a large underground/independent following. Their third album, "Machiavelli and the Four Seasons", reached the Australian national top 10 in 1995. [END]  
Answer: 30 December 1982
30 December 1982