I had a dream about December 21st (Long)?

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I had a dream about the 21st, Friday, and I'm freaked out about it. Read this and tell me what do you think?

I was at a friends house, which showed up in other dreams (I'm pretty sure) at least once before. Their basement floods alot. Anyway, we were there and left and somehow my History teacher was in it. Anyway, I think we left to the store and it was storming outside, but it was kind of different. I think I kept saying, "They say that there's supposed to be weird weather happening before the world ends. And this is weird weather." or something similar. Then I said to my friend, "Your basement is going to be flooding" and laughed a bit.
When we got back to my friends house, he went downstairs to the basement and water was coming in knee high and I kind of went down there. Then we ran out of the house, almost falling down (I think), and I think my teacher was there, but I'm not sure (my friend was not a real life friend) and we ran into a bus, and at the same time this happened a news report just showed in the screen and the video was Africa in the flood, too, and the news reported said, "And in Africa..." and there was water everywhere. I think during some time at the store someone showed us what would happen, but I'm not sure.
I just think this is weird. And another thing that is weird is that my deceased uncle posted on my mothers feed, and a few of her friends, an ad about Staples. But I think Staples posted the ad. My mom is always being communicated through electronics with my Uncle and he has been gone for 2 years, and tomorrow, the 20th, is his anniversary of his leaving.
Anyway, I just think this is all weird. I was always scared about the 21st, but didn't really know whether to think it was going to happen or not, but this dream really got me scared. What do you guys think?

[Jack]

i personally think it's all a load of bullshit. NASA even said on their website reasons why the world wasn't going to end. If it really is the end of the world we'd all die together, it'd probably be pretty cool.

[Tristan]

you were just thinking about the world ending in your dreams. no problemo. and yeah a company can send adds thru someones facebook.