Take the number of days in a leap year, add the number of months with 30 days, divide by the number of loaves in a baker's dozen, add the number of days in March, add the square root of nine, divide by the number of days in a week.
Which month are you left with?
[Ref: ZJJG] © Mr Stone
Hint: Remember that there are 13 loaves in a baker's dozen.
The numbers used are 366, +11, /13, +31, +3, /7 = 9.