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If $09/12/2001(DD/MM/YYYY)$ happens to be Sunday, then $09/12/1971$ would have been a:

  1. Wednesday
  2. Tuesday
  3. Saturday
  4. Thursday
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30 years gap with 8 leap years( 72,76,80,84,88,92,96,2000)  

in every year 1 day is forwarded  365 mod 7 =1

in every leap year 1 extra day is forwarded 366 mod 7 =1

so total days difference 30+8 =38 days

38 mod 7 =3 so 3 days are forwarded from 9/12/71 to 9/12/01

hence it was Thursday ( 3 days backward) on 9/12/71  since it was Sunday  9/12/01
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