When did the German-Danish War take place?

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The German-Danish War, also known as the Second Schleswig War, took place in 1864.1

It is important to distinguish this conflict from the earlier First Schleswig War, which occurred between 1848 and 1850. The 1864 war was a conflict between Denmark and the allied forces of Prussia and Austria over the status of the duchies of Schleswig and Holstein. Hostilities began with the invasion of Schleswig on February 1, 1864, and concluded following the Treaty of Vienna, which was signed on October 30, 1864.213