ios - dateFromComponents 给出了错误的日期

Question

我试图从 NSDateComponents 获取一个 Date 对象，但是 Calendar.date(from: Components) 给出了某一天的日期在我的原始组件中的日期之前。

let calendar = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)
let dateComponents = calendar!.components([.Year , .Month , .Weekday, .Day], fromDate: NSDate())
dateComponents.year = 2015
dateComponents.month = 9
dateComponents.day = 1

---

po calendar!.dateFromComponents(dateComponents)
▿ Optional(2015-08-31 18:30:00 +0000)
  - Some : 2015-08-31 18:30:00 +0000

Answer 1

将calendar对象的时区设置为UTC，并尝试从calendar获取Date .

calendar.timeZone = NSTimeZone(name: "UTC")!