2/04/2011 was national womens day.
The phrase in the OP comes from the show Dr. Who. I know wiki is not the best source but I found this:
The Silence is a fictional religious order or movement in the British science fiction television series Doctor Who. The Silence operate on the belief that if "the oldest question in the universe" is asked, silence will fall across the universe.Now I have no idea how the date and the phrase tie together but I don't watch the show either so there may be something I'm missing.
Edit:
fixed points in time can't be re-written.
Seems to be another quote from Dr. Who.