When Does the Film "Atragon" (1963) Take Place?
"Kaitei Gunkan"/"Undersea Warship" (released to English-speaking audiences as "Atragon", to Italian-speaking audiences as "Atoragon", to French-speaking audiences as "Ataragon", and to Spanish-speaking audiences as "Agente 04 del imperio sumergido"/"Agent 04 of the Submerged Empire") is a science fiction film written by Shinichi Sekizawa with Shigeru Komatsuzaki [adapting "The Undersea Warship: A Fantastic Tale of Island Adventure" (1899) by ShunrÅ Oshikawa and "The Undersea Kingdom" (1954) by Shigeru Komatsuzaki] that released December 22nd, 1963. So when is "Atragon" set?
It takes place in the year:
We know this because the real-world global conflict World War II is repeatedly stated to have ended 20 years ago and World War II ended in 1945 AD.

1965 AD
We know this because the real-world global conflict World War II is repeatedly stated to have ended 20 years ago and World War II ended in 1945 AD.
1,945 + 20 = 1,965.
More specifically, the Muans announce they will soon attack Tokyo on "February 10". So it is presumably February of 1965 AD.
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