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var normalCalendarDateComponents = DateComponents()
normalCalendarDateComponents.year = 2020
normalCalendarDateComponents.month = 5
normalCalendarDateComponents.day = 1

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let calendar = Calendar(identifier: .gregorian)
let normalDate = calendar.date(from: normalCalendarDateComponents)!

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let formatter = DateFormatter()
formatter.dateFormat = "MMM d, yyyy"
print(formatter.string(from: normalDate))

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let formatter = DateFormatter()
formatter.dateFormat = "MMM d, yyyy"
formatter.calendar = .init(identifier: .chinese)
formatter.dateStyle = .full
print(formatter.string(from: normalDate))

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let dict = [
  "zi": "rat",
  "chou": "ox",
  "yin": "tiger",
  "mao": "rabbit",
  "chen": "dragon",
  "si": "snake",
  "wu": "horse",
  "wei": "goat",
  "shen": "monkey",

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guard let hyphen = chineseDate.firstIndex(of: "-") else {
  fatalError("\(chineseDate) is not correctly formatted, use DateFormatter.Style.full")
}
let startIndex = chineseDate.index(after: hyphen)
let endIndex = chineseDate.index(chineseDate.endIndex, offsetBy: -2)
let branch = chineseDate[startIndex ... endIndex]
print(branch)

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func normalDate(fromYear year: Int, month: Int, day: Int) -> Date {
  var normalCalendarDateComponents = DateComponents()
  normalCalendarDateComponents.year = year
  normalCalendarDateComponents.month = month
  normalCalendarDateComponents.day = day
  
  let normalCalendar = Calendar(identifier: .gregorian)
  let normalDate = normalCalendar.date(from: normalCalendarDateComponents)!
  return normalDate
}

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let date = normalDate(fromYear: 1991, month: 6, day: 22)
let zodiac = zodiacFrom(date: date)
print(zodiac)

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let anotherDate = normalDate(fromYear: 1991, month: 1, day: 20)
let anotherZodiac = zodiacFrom(date: anotherDate)
print(anotherZodiac)