Question: On what date did Britain declare war on Germany following contention over Belgium's neutrality?
About the article "World War I", section "July Crisis".

Candidate passages:
On 4 August 1914, Britain went to war over Germany invading Belgium.
In the 1830 Treaty of London, ratified by The Netherlands in 1839 only, Belgium's neutrality was guaranteed by Britain.
However, Anglo-Belgian relations predate 4 August 1914.
Annaberg-Buchholz () is a town in the Free State of Saxony, Germany, in the Ore Mountains, and is the capital of the district of Erzgebirgskreis.
Annaberg, together with the neighbouring suburb, Buchholz, is the chief seat of the braid- and lace-making industry in Germany, introduced here by Barbara Uthmann in 1561, and further developed by Belgian refugees, who, driven from their country by the Duke of Alva, settled here in 1590. 
Belgium's "de facto" independence had been established through nine years of intermittent fighting, the Belgian Revolution.
The co-signatories of the Treaty of London—Great Britain, Austria, France, the German Confederation (led by Prussia), Russia, and the Netherlands—now officially recognised the independent Kingdom of Belgium, and at Britain's insistence agreed to its neutrality.
The treaty was an important document, especially in its role in bringing about World War I.
When the German Empire invaded Belgium in August 1914 in violation of the treaty, the British declared war on 4 August.
Informed by the British ambassador that Britain would go to war with Germany over the latter's violation of Belgian neutrality, German Chancellor Theobald von Bethmann Hollweg exclaimed that he could not believe that Britain and Germany would be going to war over a mere "scrap of paper."
Britain and Germany, along with other European Powers, were joint guarantors of Belgian neutrality under the 1839 Treaty of London.
Germany hoped that Britain would not honour the treaty and would not rush to Belgium's aid.
To Germany's dismay, Britain kept to the terms of the treaty and responded to the German aggression by declaring war on Germany.
When Edward Goschen, the British ambassador to Germany, informed German chancellor Theobald von Bethmann-Hollweg that the two countries were now at war, Bethmann-Hollweg famously replied, "The Britons will go to war for a mere scrap of paper?
"However, an alternative point of view holds that in light the Entente Cordiale, Germany's leaders had concluded that in the event of a conflict between Germany and France, Britain would declare war on Germany regardless of how the Germans prosecuted the war in the West.
Under such a conclusion, the fact that an invasion of Belgium would give Britain a convenient "casus belli" to declare war would have been irrelevant to Germany's leaders.
Regardless of what the Germans thought of the alliance between Britain and Belgium, what is more clear is that they thought Britain's small, all-volunteer army to be extremely weak and that any British forces that attempted to intervene would be easily overpowered.
The Germans only expected the British to land small numbers of troops, which would be easily slaughtered, as by this time the Germans anticipated that they would have captured the French sea ports (Calais, Dunkirk and Boulogne), thereby preventing the British from crossing in large numbers.
On the other hand, Schlieffen realized that the Russia-first strategy advocated by Moltke the Elder would have taken time to execute.
Under such a view, there is little reason to believe that Germany's leaders would not have expected the British to immediately recruit a large army from its vast Empire (if not quickly resort to conscriprion) if they were given the time to do so.
Under such a scenario, Germany's leaders would have had to consider the likely prospect of being severely outnumbered by the French and British on their western border before they would have had time to force Russia's capitulation, especially if a conflict started in late summer as actually took place in 1914.
Therefore it is reasonable to believe that, all things considered, Schlieffen may have regarded the continuation of Moltke the Elder's strategy as fool-hardy, and reasonable to assume that Schlieffen would have considered betting on a quick German victory in the West to be a better gamble as opposed to pursuing a strategy whose success would have been utterly dependent on British goodwill. 
 Germany's Foreign Minister, Gottlieb von Jagow, said in a speech at the Reichstag that German would respect the guarantees of Belgium's neutrality, followed by Minister of War Josias von Heeringen, who pledged that "Germany will not lose sight of the fact that the neutrality of Belgium is guaranteed by international treaty."
Germany would invade Belgium fifteen months later on its entry into World War I on August 2, 1914.  
Another factor that influenced Chamberlain's policy during the Czechoslovak crisis was the attitude of the Dominions.
With the partial exception of New Zealand, all of the Dominions, particularly Canada and South Africa were entirely in favor of concessions to avert a war in Central Europe that they felt did not concern them, and were quietly critical of Chamberlain for running what they regarded as unacceptable risks of war for a cause that they did not care about.
The Dominion attitudes had great influence with Chamberlain, as he believed that Britain could not fight, let alone win a war without the support of the entire Commonwealth.
Ever since the Chanak Crisis of 1922, it had understood in London that Britain could not count on the automatic support of the Dominions, and it was quite possible for a situation to occur where the Dominions might declare neutrality rather than fight for Britain.
The editor of "The Times", Geoffrey Dawson, later recalled that: "No one who sat in this place, as I did during the autumn of '38, with almost daily visitations from eminent Canadians and Australians, could fail to realize that war with Germany at that time would have been misunderstood and resented from end to end of the Empire.
Even in this country there would have been no unity behind it".