In my blog post about the sunken Costa Concordia, I speculated that.... if we count 266 days - [38 weeks] - which equals the nine months of a human pregnancy [chevlei Moshiach] - we end up on October 7/ 21 Tishrei - Hoshanna Rabba 5773
If you read that blog post, you will remember that the same number 266 was echo-ed by the amount the DOW fell when the Stock Market crashed on August 2nd 2011 [Mincha Gedola].
Seems that The Vilna Gaon predicted this a few hundred years ago:
...The Vilna Gaon on the Mechilta [Shmos 14:20] and the Midrash Talpiyos [Gog] say, that the Gog U'Magog war shall begin three hours before "Hanetz Hachama" [crack of dawn] on Hoshana Rabba, and shall last three hours only. This is why we say " הוֹשַׁעְנָא שָׁלֹש שָׁעוֹת " If we connect this to what the Zohar quoted above said that the war will be in the 73rd year of the century, it comes out that the war shall take place on Hoshana Rabba of 5773.
The date 773 equals "crack of dawn on Hoshana Rabba":
.תשע"ג בְּגִימַטְרִיָּא הָנֵץ הֹשַׁעְנָא רַבָּא
Read more at: Rav Fish Sod HaChashmal Gog U'Magog