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DayInEra不一致的。如果我有個約會深夜和我住在美國東海岸，我DayInEra計算似乎不包括時區偏移。但我的DayInYear計算工作正常。計算與DayInYear
我把下面的一個操場上的問題從我的代碼分離：
var dateLastNite : NSDate = NSDate(timeIntervalSince1970: 1430190884.0)
var dateMorning : NSDate = NSDate(timeIntervalSince1970: 1430224884.0)
var dateEvening : NSDate = NSDate(timeIntervalSince1970: 1430276884.0)
var curCal : NSCalendar = NSCalendar.currentCalendar()
var tz : NSString = curCal.timeZone.abbreviation!
var dayOfYearPast : NSInteger = curCal.ordinalityOfUnit(NSCalendarUnit.CalendarUnitDay, inUnit: NSCalendarUnit.CalendarUnitYear, forDate: dateLastNite)
var dayOfYearAM : NSInteger = curCal.ordinalityOfUnit(NSCalendarUnit.CalendarUnitDay, inUnit: NSCalendarUnit.CalendarUnitYear, forDate: dateMorning)
var dayOfYearPM : NSInteger = curCal.ordinalityOfUnit(NSCalendarUnit.CalendarUnitDay, inUnit: NSCalendarUnit.CalendarUnitYear, forDate: dateEvening)
var dayOfEraPast : NSInteger = curCal.ordinalityOfUnit(NSCalendarUnit.CalendarUnitDay, inUnit: NSCalendarUnit.CalendarUnitEra, forDate: dateLastNite)
var dayOfEraAM : NSInteger = curCal.ordinalityOfUnit(NSCalendarUnit.CalendarUnitDay, inUnit: NSCalendarUnit.CalendarUnitEra, forDate: dateMorning)
var dayOfEraPM : NSInteger = curCal.ordinalityOfUnit(NSCalendarUnit.CalendarUnitDay, inUnit: NSCalendarUnit.CalendarUnitEra, forDate: dateEvening)
的DayOfYearPast結果是117和兩個AM和PM有118
但DayOfEraPast和dayOfEraAM我得到735716 而DayOfEraPM我得到735717
爲什麼時代結果沒有任何解釋：如我所料