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Thanks Michel

Answer :
This year we will experience four unusual dates : 1/1/11, 1/11/11, 11/1/11 and 11/11/11.
Now for the "strange" part :
take the last two digits of the year you were born in and add the age you'll be this year.

It should equal 111 (unless you were born after 2000, then it will be 11).
PS :

In 2011, October will have 5 Sundays, 5 Mondays and 5 Saturdays.
And, July has 5 Fridays, 5 Saturdays and 5 Sundays!

This happens only every 823 years.

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