Instructions

Step one:

• A is quotient obtained by division of the selected year by 100
• B is residual/remainder when dividing selected year by 100

Step two

• a = (A + 8) / 25 (discard residual/remainder)

Step three

• b = (A + 1 - a) / 3 (discard residual/remainder)

Step four

• c = A / 4 (discard residual/remainder)

Step five

• d is residual/remainder when dividing selected year by 19

Step six

• f is residual/remainder when dividing (11d + 1) by 30

Step seven

• g is residual/remainder when dividing (A - b - c - f + 46) by 30

Step eight

• h = B / 4 (discard residual/remainder)

Step nine

• k is residual/remainder when dividing (5A + B + h + c) by 7

Step ten

• m is residual/remainder when dividing (39 - g - k) by 7

Step eleven

• If g + m > 9 Easter is on (g + m - 9)[st/nd/rd/th] of April
• If g + m ≤ Easter is on (22 + g - m)[st/nd/rd/th] of March

Exceptions:

• If g = 29 and m = 6 Easter is on 19th, not 26th, of April
• If g = 28 and m = 6 Easter is on 18th, not 25th, of April