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Osnovna škola "Tin Ujević" Osijek

 > Projekti  > Erasmus+  > Easter Date
 

Easter date calculation

 

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
 

You can check your result here

Remark:
- next step will be displayed if the result in the current step is correct.

 

Calculate and enter the result in input fields:
  • A: quotient in division selected year and 100 (year / 100)
  • B: residual/remainder in division year and 100
  • a: (A + 8) / 25 (discard residual/remainder)
  • b: (A + 1 - a) / 3 (discard residual/remainder)
  • c: A / 4
  • d: residual/remainder when dividing selected year by 19
  • f: residual/remainder when dividing (11d + 1) / 30
  • g: residual/remainder when dividing (A - b - c - f + 46) / 30
  • h: quotient when dividing B / 4
  • k: residual when dividing (5A + B + h + c) / 7
  • m: residual/remainder when dividing (39 - g - k) / 7

 

 

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 > Projekti  > Erasmus+  > Easter Date
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Osnovna škola "Tin Ujević" Osijek / Opatijska 46, HR-31000 Osijek / os-tujevic-os.skole.hr / ured@os-tujevic-os.skole.hr
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