Using NSDate to get date for Easter -


i'm working on application requires use of getting dates national holidays.

below, able memorial day:

// set components memorial day (last monday of may)  let memorialdaycomps = nsdatecomponents() memorialdaycomps.weekday = 2 memorialdaycomps.month = 5 memorialdaycomps.year = currentyear  var mondaysofmay = [nsdate]()  var = 1; <= 5; i++ {     memorialdaycomps.weekdayordinal =     let monday = calendar.datefromcomponents(memorialdaycomps)     let components = calendar.components(.calendarunitmonth, fromdate: monday!)     if components.month == 5 {         mondaysofmay.append(monday!)     } } let memorialdaydate = mondaysofmay.last

because dates pretty set, able create nsdate instances following holidays:

  • new year's day
  • martin luther king, jr. day
  • presidents' day
  • memorial day
  • independence day
  • labor day
  • thanksgiving day
  • christmas day

however, 1 having difficulty figuring out how easter. varies every year, i'm curious whether else has been able date easter via api or other means.

i able find gist on github has solution accurate calculating , returning nsdate easter.

the code below gist contains:

// easter calculation in swift after anonymous gregorian algorithm // known meeus/jones/butcher algorithm  func easter(y : int) -> nsdate {   let = y % 19   let b = int(floor(double(y) / 100))   let c = y % 100   let d = int(floor(double(b) / 4))   let e = b % 4   let f = int(floor(double(b+8) / 25))   let g = int(floor(double(b-f+1) / 3))   let h = (19*a + b - d - g + 15) % 30   let = int(floor(double(c) / 4))   let k = c % 4   let l = (32 + 2*e + 2*i - h - k) % 7   let m = int(floor(double(a + 11*h + 22*l) / 451))   let components = nsdatecomponents()   components.year = y   components.month = int(floor(double(h + l - 7*m + 114) / 31))   components.day = ((h + l - 7*m + 114) % 31) + 1   components.timezone = nstimezone(forsecondsfromgmt: 0)   let cal = nscalendar(calendaridentifier: nsgregoriancalendar)   return cal.datefromcomponents(components) }  println(easter(2014))  // "2014-04-20 00:00:00 +0000"

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