In which year will the calendar be identical to that of 2009?

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Accepted Answer

To determine the year with the same calendar as 2009, we analyze the progression of odd days. Since 2008 was a leap year with two odd days, the first day of 2009 was Wednesday if 2008 began on a Monday. Counting odd days for subsequent years:

- **2009:** Regular year, +1 odd day → Wednesday  
- **2010:** Regular year, +1 odd day → Thursday  
- **2011:** Regular year, +1 odd day → Friday  
- **2012:** Leap year, +2 odd days → Saturday  
- **2013:** Regular year, +1 odd day → Monday  
- **2014:** Regular year, +1 odd day → Tuesday  
- **2015:** Regular year, +1 odd day → Wednesday

Thus, the calendar for 2009 matches that of 2015 because both start on a Wednesday and follow the same leap year pattern.

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