OK, so the First Sunday of Advent was 11/30/1969. Add 15480 days and you get April 17, 2012. I wonder if that's close to Holy Week that year.
Then another 540 days puts us at 10/08/2013. If I'm off by a day due to whether I should be inclusive or exclusive of the end date, that could be 10/07/2013 (Feast of the Holy Rosary).
I'm guessing that the first set of dates is closer because of the Blessed Tomasuccio quote and because Daniel used a "decree" to rebuild the temple for his famous prophecies regarding the exact time of Our Lord's death. But who's to know?
Could be all just :smoke-pot: too !