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Date/WarDay of the week
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10 May 1940 – Netherlands declared war on Germany.FridayFriday13
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27 June 1941 – Hungary declared war on the Soviet Union.FridayMonday 5
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12 December 1941 – Bulgaria, Hungary, Romania and Slovakia declare war on the United States of America and Great Britain.FridaySaturday9
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19 December 1941 – Nicaragua declared war on Bulgaria, Hungary and Romania.FridaySunday8
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22 May 1942 – Mexico declared war on Germany, Italy and Japan.FridayThursday6
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2 April 1943 – Bolivia declared war on all Axis members.FridayTuesday3
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25 August 1944 – Romania (after switching sides) declared war on Germany.FridayWednesday7
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23 February 1945 – Turkey declared war on Germany and Japan.Friday
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6 July 1945 - Norway declared war on Japan[12]Friday
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5/11/1982Friday
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12/15/1989Friday
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12/23/2005Friday
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6/13/2008Friday
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10 June 1940 – Italy declared war on UK and France.Monday
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8 December 1941 – The United States of America, United Kingdom, Australia, Costa Rica, The Dominican Republic, El Salvador, Haiti, Honduras, The Netherlands, New Zealand and Nicaragua declare war on Japan.Monday
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12 February 1945 – Peru in state of belligerency with Germany and Japan.Monday
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26 February 1945 – Syria declared war on Germany and Japan.Monday
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9/22/1980Monday
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23 November 1940 – Belgian government in exile declared war on Italy.Saturday
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13 December 1941 – United Kingdom, New Zealand and the Union of South Africa declare war on Bulgaria.Saturday
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20 December 1941 – Belgium declared war on Japan.Saturday
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22 August 1942 – Brazil declared war on Germany and Italy.Saturday
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24 February 1945 – Egypt declared war on Germany and Japan.Saturday
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3 March 1945 – Finland declared war on Germany.Saturday
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5/15/1948Saturday
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5/14/1998Saturday
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8/9/2008Saturday
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3 September 1939 – United Kingdom, India,[10] France, Australia and New Zealand declared war on Germany.Sunday
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10 September 1939 – Canada declared war on Germany.Sunday
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7 December 1941 – Empire of Japan declared war on the United States of America, United Kingdom, Australia, New Zealand, and South Africa.Sunday
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7 December 1941 – United Kingdom, Canada, Australia and New Zealand declared war on Finland, Romania and Hungary.Sunday
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7 December 1941 – Panama declared war on Japan.Sunday
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14 December 1941 – Croatia declared war on the United States of America and Great Britain.Sunday
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25 January 1942 – Great Britain, New Zealand and the Union of South Africa declare war on Thailand.Sunday
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4/11/2012Sunday
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11 December 1941 – Germany and Italy declared war on the United States of America.Thursday
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11 December 1941 – The United States of America declared war on Germany and Italy.Thursday
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9 September 1943 – Iran declared war on Germany.Thursday
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21 September 1944 – San Marino declared war on Germany.Thursday
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15 February 1945 – Venezuela and Uruguay declare war on Germany and Japan.Thursday
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1 March 1945 – Saudi Arabia declared war on Japan.Thursday
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9 December 1941 – Republic of China declared war on Japan, Italy and Germany.Tuesday
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16 December 1941 – Czechoslovak government in exile declares war on all countries at war with the United States of America, Great Britain and the Soviet Union.Tuesday
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6 January 1942 – Australia declared war on Bulgaria.Tuesday
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6 September 1939 – South Africa declared war on Germany.Wednesday
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24 April 1940 - Germany declared war on Norway[11]Wednesday
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25 June 1941 – Finland declared war on the Soviet Union.Wednesday
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17 December 1941 – Albania (under Italian occupation) declared war on the United States of America.Wednesday
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13 October 1943 – Italy (after switching sides) declared war on Germany.Wednesday
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7 February 1945 – Argentina and Paraguay declared war on Germany and Japan.Wednesday
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11 April 1945 – Chile declared war on Japan.Wednesday
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