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The length of most 12-year periods is 626 weeks and one day. It's that one day that puts a certain date on the subsequent weekday after twelve years, just as a certain date is on the subsequent weekday after one regular year, the length of which is 52 weeks and one day. (If there's a leap year day during the intervening year, the date will fall a weekday later.)

12-year periods that include the year 2100 will be exactly 626 weeks long, since 2100 is not a leap year, so the weekday will be the same after a twelve-year period that includes 2100. (2100 will be only the fourth year that is different from the Julian calendar since the world started switching to the Gregorian calendar in 1582; the other years that were different were 1700, 1800 and 1900.)

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Q: Why is the leap day always one weekday later after twelve years - as in 2000 it was Tuesday and in 2012 it was Wednesday?
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