I got this on March the 24th so you just got really lucky.

I know, that was scary!

А у нас на 9 мая парады устраивают...

I saw a documentary about the battle of (or for) Moscow by the Nazis during WW II. The Nazi forces came extremely close to capturing Moscow, and reportedly Stalin serious considered abandoning the city, to re-establish Soviet forces to the east.

By December 7, the Soviet armies had suffered incredible losses, and the situation was beyond dire, with so many unknowns to be factored in - but then Japan attacked Pearl Harbor in a sneak operation, and Stalin knew that the US would enter the war. That fact played some part in his decision not to leave Moscow, and Hitler was reportedly both surprised and furious with the Japanese for launching the attack before he'd been able to take Moscow.

Mind you, there's nothing the US did, other than declare war on Japan on December 8, then on Germany on December 11 (hours after Hitler declared war on the US), but it was a strong piece of propaganda which could give some increased hope against the German war machine.

The US can't take any credit for what the Soviet armies did against the Nazis in the battle of Moscow, but the Japanese attack on Dec. 7 was just one of the stupidest political mistakes the Axis powers made in WW II. If Japan had consulted with Hitler before launching its attack, or just waited a month, that faint glint of help from afar would not have appeared. It changed the complexion of the war immediately, because Stalin knew that, eventually, Hitler would have to deal with both the British and the Americans, sapping some of the strength from the German armies invading Russia.

Theoretically it could be «седьмо́е число́» («Сего́дня седьмо́е число́ декабря́» sounds OK), but I don't think it describes anything at all. Neuter singular adjectives are often used without a noun, as in the proverb «лу́чшее — вра́г хоро́шего» 'perfect is the enemy of good'.