sorry if this has already been posted...   found on Reddit.   
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The March 11 date came about because it is 180 days from the publication of the proposed BATS rule change in the Federal Register - there can be no more 45 or 90 day delays - SEC must approve or reject, with no decision = acceptance (Rule 19, Sec Exch Act of 1934)...

 But look at how time periods for publications in the Federal Register are calculated pursuant to 1 CFR 18.17(b):

"Dates certain will be computed by counting the day after the publication day as one, and by counting each succeeding day, including Saturdays, Sundays, and holidays. However, where the final count would fall on a Saturday, Sunday, or holiday, the date certain will be the next succeeding Federal business day."

That would put us at Monday, March 13 for the deadline.
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