如何获取当前月份的开始日期和结束日期（Swift 3）

我试图以dd/MM/yyyy格式获取当前月份的开始日期和结束日期。我尝试使用扩展名为SO Question。但它看起来不是我想要的（格式不同，它也给我上个月的最后一个日期和本月最后一个日期）。有人能帮我吗。如何获取当前月份的开始日期和结束日期（Swift 3）

扩展类：

extension Date { 
    func startOfMonth() -> Date? { 
     let comp: DateComponents = Calendar.current.dateComponents([.year, .month, .hour], from: Calendar.current.startOfDay(for: self)) 
     return Calendar.current.date(from: comp)! 
    } 

    func endOfMonth() -> Date? { 
     var comp: DateComponents = Calendar.current.dateComponents([.month, .day, .hour], from: Calendar.current.startOfDay(for: self)) 
     comp.month = 1 
     comp.day = -1 
     return Calendar.current.date(byAdding: comp, to: self.startOfMonth()!) 
    } 
}

我的结构：

struct Constants{ 

    // keys required for making a Login call (POST Method) 
    struct LoginKeys { 
     ..... 
    } 

    struct RankingKeys { 

     static let DateFrom = String(describing: Date().startOfMonth()) //giving me 2016-11-30 16:00:00 +0000 
     static let DateTo = String(describing: Date().endOfMonth()) 
//2016-12-30 16:00:00 +0000 
    } 
}

预期结果：

DateFrom = "01/12/2016" 
DateTo = "31/12/2016"

来源

2016-12-19 ASN

可能是时区问题。 –

即使日期是错误的。开始日期应为12月的第一天，结束日期应为31日，但产出不同 – ASN

您的代码没问题。您在当地时间获得正确的值。请学习如何阅读记录日期对象的输出。注意输出中的时区。 – rmaddy

你应该写这个简单的代码：

let dateFormatter = DateFormatter() 
let date = Date() 
dateFormatter.dateFormat = "dd-MM-yyyy"

开始日期：

let comp: DateComponents = Calendar.current.dateComponents([.year, .month], from: date) 
let startOfMonth = Calendar.current.date(from: comp)! 
print(dateFormatter.string(from: startOfMonth))

对于最终日期：

var comps2 = DateComponents() 
comps2.month = 1 
comps2.day = -1 
let endOfMonth = Calendar.current.date(byAdding: comps2, to: startOfMonth) 
print(dateFormatter.string(from: endOfMonth!))

来源

2016-12-19 06:53:33

此扩展你预期的输出按你想

这里我回覆关闭日期

extension NSDate { 
    func startOfMonth() -> NSDate? { 
     guard 
      let cal: NSCalendar = NSCalendar.currentCalendar(), 
      let comp: NSDateComponents = cal.components([.Year, .Month], fromDate: self) else { return nil } 
     comp.to12pm() 
     let dateformattor = NSDateFormatter() 
     dateformattor.dateFormat = "yyyy-MM-dd" 
     dateformattor.timeZone = NSTimeZone.localTimeZone() 
     let dt2 = dateformattor.stringFromDate(cal.dateFromComponents(comp)!) 
     print(dt2) 

     dateformattor.dateFormat = "yyyy-MM-dd" 
     dateformattor.timeZone = NSTimeZone.init(abbreviation: "UTC") 

     return dateformattor.dateFromString(dt2) 
    } 

    func endOfMonth() -> NSDate? { 
     guard 
      let cal: NSCalendar = NSCalendar.currentCalendar(), 
      let comp: NSDateComponents = NSDateComponents() else { return nil } 
     comp.month = 1 
     comp.day = -1 
     comp.to12pm() 
     let dateformattor = NSDateFormatter() 
     dateformattor.dateFormat = "yyyy-MM-dd" 
     dateformattor.timeZone = NSTimeZone.localTimeZone() 
     let dt2 = dateformattor.stringFromDate(cal.dateByAddingComponents(comp, toDate: self.startOfMonth()!, options: [])!) 

     dateformattor.dateFormat = "yyyy-MM-dd" 
     dateformattor.timeZone = NSTimeZone.init(abbreviation: "UTC") 

     return dateformattor.dateFromString(dt2) 
    } 
} 
internal extension NSDateComponents { 
    func to12pm() { 
     self.hour = 12 
     self.minute = 0 
     self.second = 0 
    } 
}

** OUTPUT： - **

Start Date of Month :- 2016-12-01 00:00:00 +0000 
End Date of Month :- 2016-12-31 00:00:00 +0000

来源

2016-12-19 06:49:26

问题是如何在Swift 3中做到这一点。这是一个Swift 2的答案。 – Rob

@Rob我请求提问者在swift 2.2中发布答案，并在他允许后发布它 –

这段代码有太多的错误。为什么在创建日期前将组件设置为12点？日期格式化程序默认为本地时间，因此不需要将其明确设置为本地时间。为什么要将日期转换为字符串，然后回到UTC的日期？大部分发布代码都是不必要的。 – rmaddy

与SWIFT 3 & iOS的10，我发现这样做的最简单的方法是Calendar的dateInterval(of:for:)：

guard let interval = calendar.dateInterval(of: .month, for: Date()) else { return }

然后使用日期格式打印日期：

let formatter = DateFormatter() 
formatter.dateFormat = "dd-MM-yyyy" 
let dateText = formatter.string(from: interval.start)

来源

2017-05-09 01:33:39 LuisCien

这是我正在使用的。很简单，但它的作品。

extension Calendar { 

func dayOfWeek(_ date: Date) -> Int { 
    var dayOfWeek = self.component(.weekday, from: date) + 1 - self.firstWeekday 

    if dayOfWeek <= 0 { 
     dayOfWeek += 7 
    } 

    return dayOfWeek 
} 

func startOfWeek(_ date: Date) -> Date { 
    return self.date(byAdding: DateComponents(day: -self.dayOfWeek(date) + 1), to: date)! 
} 

func endOfWeek(_ date: Date) -> Date { 
    return self.date(byAdding: DateComponents(day: 6), to: self.startOfWeek(date))! 
} 

func startOfMonth(_ date: Date) -> Date { 
    return self.date(from: self.dateComponents([.year, .month], from: date))! 
} 

func endOfMonth(_ date: Date) -> Date { 
    return self.date(byAdding: DateComponents(month: 1, day: -1), to: self.startOfMonth(date))! 
} 

func startOfQuarter(_ date: Date) -> Date { 
    let quarter = (self.component(.month, from: date) - 1)/3 + 1 
    return self.date(from: DateComponents(year: self.component(.year, from: date), month: (quarter - 1) * 3 + 1))! 
} 

func endOfQuarter(_ date: Date) -> Date { 
    return self.date(byAdding: DateComponents(month: 3, day: -1), to: self.startOfQuarter(date))! 
} 

func startOfYear(_ date: Date) -> Date { 
    return self.date(from: self.dateComponents([.year], from: date))! 
} 

func endOfYear(_ date: Date) -> Date { 
    return self.date(from: DateComponents(year: self.component(.year, from: date), month: 12, day: 31))! 
} 
}

来源

2017-06-06 16:06:02

如何获取当前月份的开始日期和结束日期（Swift 3）

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