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I have just learned that September 18, 2001, the day on which the first wave of anthrax letters was sent, was Rosh Hashanah, the Jewish New Year. Follow that link and scroll down (I'm "mitch p."), to see me trying to assimilate this fact.

A synopsis:

Bin Laden's International Islamic Front exists to fight the Crusader-Zionist alliance (in secular language: Christian and Jewish imperialism). Organizationally, it was principally an alliance between Egyptian and Saudi Islamists.
Egypt is the pivot of the Arab world - the largest Arab country, under Nasser the leader of the fight against Israel, under Sadat the first to recognize Israel, and the place in which people like Zawahiri hope to restore the caliphate. (I believe I read, in Peter Lance's Thousand Years for Revenge, a rant by the blind sheikh Omar Abdel Rahman, in which he talks about a "snake with two heads", one in Egypt, one in Israel.)
The Coptic Christians are the largest non-Islamic group in Egyptian society, and a target of Islamist suspicion and persecution. Sadat's foreign minister, the future UN Secretary-General during the era of the peace process, Boutros Boutros-Ghali, is a Copt.
September 11, 2001, was the Coptic New Year (and also the thirtieth anniversary of the adoption of Egypt's current constitution, which took place under Sadat).
September 18, 2001, was the Jewish New Year.
Shortly after 9/11, both bin Laden and his ally Hamid Gul floated the idea that the attack was the work of Jews angry about Bush's election victory in Florida.
The hijackers positioned themselves in Palm Beach County, home of the butterfly ballot, after the election. That is where the first anthrax case occurred, and reportedly the J-Lo letter contained a Star of David (although, as with everything surrounding the Florida anthrax letters, this is far from certain).

So it looks as if 9/11 was a blow directed at the Crusaders, especially their fellow-travelers in Egypt, and 9/18 was a follow-up, somehow meant to sow dissension between the Crusaders and their allies, the Zionists.

I've never found the various "date" or "anniversary" theories of Islamic terrorist acts to be convincing.

If they were to do something on an anniversary, wouldn't it be the anniversary according to the Islamic calendar (which would make it a completely different date on our Gregorian calendar)?

Does anyone know of any terrorist acts that have been acknowledged by al-Qaeda or some similar group as having been staged intentionally on a Gregorian-calendar anniversary date?

I think that the anniversary theory of Islamic terrorism may be a Western myth, created by people in our culture trying to find some order among these chaotic terrorist acts.

Now, in contrast to Muslims, Westerners have been known to choose anniversary dates. Tim McVeigh chose the anniversary of Waco for the Oklahoma City bombing, for example. (Even if he was a patsy of Muslims, as in some theories making the rounds, the date selection was clearly done by someone in the U.S. based on American issues.)