Passage: In the first week of World War I Japan proposed to the United Kingdom, its ally since 1902, that Japan would enter the war if it could take Germany's Pacific territories. On 7 August 1914, the British government officially asked Japan for assistance in destroying the raiders from the Imperial German Navy in and around Chinese waters. Japan sent Germany an ultimatum on 23 August 1914, which went unanswered; Japan then formally declared war on Germany on 23 August 1914 in the name of the Emperor Taishō. As Vienna refused to withdraw the Austro-Hungarian cruiser SMS Kaiserin Elisabeth from Qingdao, Japan declared war on Austria-Hungary, too, on 25 August 1914.Japanese forces quickly occupied German-leased territories in the Far East. On 2 September 1914, Japanese forces landed on China's Shandong province and surrounded the German settlement at Tsingtao (Qingdao).  During October, acting virtually independently of the civil government, the Imperial Japanese Navy seized several of Germany's island colonies in the Pacific - the Mariana, Caroline, and Marshall Islands - with virtually no resistance. The Japanese Navy conducted the world's first naval-launched air raids against German-held land targets in Shandong province and ships in Qiaozhou Bay from the seaplane-carrier Wakamiya. On 6 September 1914 a seaplane launched by Wakamiya unsuccessfully attacked the Austro-Hungarian cruiser Kaiserin Elisabeth and the German gunboat Jaguar with bombs.The Siege of Tsingtao concluded with the surrender of German colonial forces on 7 November 1914.

Question: when did German colonial forces surrendered
7 November 1914