if Y mod 19 = 8 , subtract 1 : if the result is less than 19 , the month is April , instead of March : For the example of 2038 ( mod 19 = 5 ) , PFMd = ( 45 - 5 × 11 mod 30 ) mod 31 = 45 - 25 - 2 mod 31 = 18A.The epacts are used to find the dates of the new moon in the following way : Write down a table of all 365 days of the year ( the leap day is ignored ) .
PFMd = ( 45 - 5 × 11 mod 30 ) mod 31 = 45 - 25 - 2 mod 31 = 18A .