World War I took place from 28 July 1914 to 11 November 1918.

Quick Scoop: Key dates

  • Start of WW1: 28 July 1914, when Austria‑Hungary declared war on Serbia after the assassination of Archduke Franz Ferdinand.
  • End of WW1: 11 November 1918, when the armistice with Germany came into effect on the Western Front.
  • Common way it’s described: “World War I (1914–1918).”

In short, if you just need the basic timeline for “when did WW1 happen,” remember: 1914 to 1918.

Information gathered from public forums or data available on the internet and portrayed here.