首页 文章

NSDate从一天开始到一天结束

提问于
浏览 次
77
-(NSDate *)beginningOfDay:(NSDate *)date
{
    NSCalendar *cal = [NSCalendar currentCalendar];
    NSDateComponents *components = [cal components:( NSMonthCalendarUnit | NSYearCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit ) fromDate:date];

    [components setHour:0];
    [components setMinute:0];
    [components setSecond:0];

    return [cal dateFromComponents:components];

}

-(NSDate *)endOfDay:(NSDate *)date
{
    NSCalendar *cal = [NSCalendar currentCalendar];
    NSDateComponents *components = [cal components:(  NSMonthCalendarUnit | NSYearCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit ) fromDate:date];

    [components setHour:23];
    [components setMinute:59];
    [components setSecond:59];

    return [cal dateFromComponents:components];

}

当我打电话：[self endOfDay：[NSDate date]];我得到了本月的第一天......为什么？我使用这两种方法，因为我需要一个从第一个日期的第一秒开始的间隔（beginningOfDay：date1）到第二个日期的最后一秒（endOfDay：Date2）......

ios nsdate nsdatecomponents

17 回答

  • 19

    For swift 4

    var calendar = Calendar.current
    calendar.timeZone = NSTimeZone(abbreviation: "UTC")! as TimeZone
    let dateAtMidnight = calendar.startOfDay(for: Date())

    //For End Date
    var components = DateComponents()
    components.day = 1
    components.second = -1

    let dateAtEnd = calendar.date(byAdding: components, to: dateAtMidnight)

    print("dateAtMidnight :: \(dateAtMidnight)")
    print("dateAtEnd :: \(dateAtEnd!)")
    回复于
  • 28

    在iOS 8中，这非常方便;你可以做：

    let startOfDay = NSCalendar.currentCalendar().startOfDayForDate(date)

    为了结束一天的结束，只需使用NSCalendar方法23小时59分59秒，具体取决于您如何定义一天的结束时间 .

    // Swift 2.0
let components = NSDateComponents()
components.hour = 23
components.minute = 59
components.second = 59
let endOfDay = NSCalendar.currentCalendar().dateByAddingComponents(components, toDate: startOfDay, options: NSCalendarOptions(rawValue: 0))

    Date Math

    Apple iOS NSCalendar Documentation . （参见章节： Calendrical Calculations ）

    NSCalendar methods discussed by NSHipster .

    回复于
  • 2

    Swift 4 简单而精确的答案 .

    开始时间：00：00：00

    结束时间：23：59：59.5

    var date = Date() // current date or replace with a specific date
var calendar = Calendar.current
let dateAtMidnight = calendar.startOfDay(for: date)
let dateAtEnd = calendar.date(bySettingHour: 23, minute: 59, second: 59, of: date)
    回复于
  • 4

    Objective-C

    NSCalendar * calendar = [NSCalendar currentCalendar];
NSDate * startDate = [calendar startOfDayForDate:[NSDate date]];
NSLog(@"start date is %@", startDate);
    回复于
  • 3

    我对NSDate的Swift扩展：

    Swift 1.2

    extension NSDate {

    func beginningOfDay() -> NSDate {
        var calendar = NSCalendar.currentCalendar()
        var components = calendar.components(.CalendarUnitYear | .CalendarUnitMonth | .CalendarUnitDay, fromDate: self)
        return calendar.dateFromComponents(components)!
    }

    func endOfDay() -> NSDate {
        var components = NSDateComponents()
        components.day = 1
        var date = NSCalendar.currentCalendar().dateByAddingComponents(components, toDate: self.beginningOfDay(), options: .allZeros)!
        date = date.dateByAddingTimeInterval(-1)!
        return date
    }
}

    Swift 2.0

    extension NSDate {

    func beginningOfDay() -> NSDate {
        let calendar = NSCalendar.currentCalendar()
        let components = calendar.components([.Year, .Month, .Day], fromDate: self)
        return calendar.dateFromComponents(components)!
    }

    func endOfDay() -> NSDate {
        let components = NSDateComponents()
        components.day = 1
        var date = NSCalendar.currentCalendar().dateByAddingComponents(components, toDate: self.beginningOfDay(), options: [])!
        date = date.dateByAddingTimeInterval(-1)
        return date
    }
}
    回复于
  • 16

    您在组件中缺少 NSDayCalendarUnit .

    回复于
  • 3

    您不必将组件设置为零，只需忽略它们：

    -(NSDate *)beginningOfDay:(NSDate *)date
{
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *components = [calendar components:NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit fromDate:date];
    return [calendar dateFromComponents:components];
}
    回复于
  • 4

    对我来说，这里没有任何答案，否则stackoverflow工作的地方 . 为了开始今天，我做到了这一点 .

    NSCalendar * gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian]; 
[gregorian setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];    
NSDateComponents *components = [gregorian components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay fromDate:[NSDate date]]; 
[components setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]]; 
NSDate *beginningOfToday = [gregorian dateFromComponents:components];

    请注意 [gregorian setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]]; 和 [components setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]]; .

    创建日历时，它会使用当前时区进行初始化，并且从其组件中提取日期时，由于NSDate没有时区，因此从当前时区开始的日期将被视为UTC时区 . 因此，我们需要在提取组件之前设置时区，然后在从这些组件中提取日期时设置时区 .

    回复于
  • 1

    自 iOS 8.0+ / macOS 10.12+ / tvOS 10.0+ / watchOS 3.0+ 以来，基金会内置了一个内置功能，您可以直接使用它 . 无需实现自己的功能 .

    public func startOfDay(for date: Date) -> Date

    所以你可以这样使用它：

    let midnightDate = Calendar(identifier: .gregorian).startOfDay(for: Date())

    值得记住的是，这需要考虑设备时区 . 如果您想拥有例如UTC区域，可以在 calendar 上设置 .timeZone .

    链接到Apple参考页面：https://developer.apple.com/reference/foundation/nscalendar/1417161-startofday .

    回复于
  • 2

    只是使用 dateInterval(of:start:interval:for:) Calendar 的另一种方式

    返回 startDate 包含当天的开始， interval 包含当天的秒数 .

    func startAndEnd(of date : Date) -> (start : Date, end : Date) {
    var startDate = Date()
    var interval : TimeInterval = 0.0
    Calendar.current.dateInterval(of: .day, start: &startDate, interval: &interval, for: date)
    var endDate = startDate.addingTimeInterval(interval-1)
    return (start : startDate, end : endDate)
}

let (start, end) = startAndEnd(of: Date())
print(start, end)
    回复于
  • 11

    获得结果的另一种方法：

    NSDate *date = [NSDate date];

NSDateComponents *components = [[NSDateComponents alloc] init];
components.day = [[NSCalendar currentCalendar] ordinalityOfUnit:(NSCalendarUnitDay) inUnit:(NSCalendarUnitEra) forDate:date];
NSDate *dayBegin = [[NSCalendar currentCalendar] dateFromComponents:components];

components.day += 1;
NSDate *dayEnd = [[NSCalendar currentCalendar] dateFromComponents:components];
    回复于
  • 1

    Swift 3

    class func today() -> NSDate {
        return NSDate()
    }

    class func dayStart() -> NSDate {
          return NSCalendar.current.startOfDay(for: NSDate() as Date) as NSDate
    }

    class func dayEnd() -> NSDate {
        let components = NSDateComponents()
        components.day = 1
        components.second = -1
        return NSCalendar.current.date(byAdding: components as DateComponents, to: self.dayStart() as Date)
    }
    回复于
  • 0
    extension Date {
    func stringFrom(dateFormat: String) -> String {
        let formatter = DateFormatter()
        formatter.dateFormat = dateFormat
        return formatter.string(from: self)
    }

    func firstSecondInDay() -> Date {
        let dayStr = self.stringFrom(dateFormat: "yyyy-MM-dd")
        let firstSecondStr = "\(dayStr) 00:00:00"
        let format = DateFormatter()
        format.dateFormat = "yyyy-MM-dd HH:mm:ss"
        return format.date(from: firstSecondStr)!
    }

    func lastSecondInDay() -> Date {
        let dayStr = self.stringFrom(dateFormat: "yyyy-MM-dd")
        let laseSecondStr = "\(dayStr) 23:59:59"
        let format = DateFormatter()
        format.dateFormat = "yyyy-MM-dd HH:mm:ss"
        return format.date(from: laseSecondStr)!
    }
}
    回复于
  • 1

    一天的开始/一天的结束 - 斯威夫特4

    // Extension

extension Date {
    var startOfDay: Date {
        return Calendar.current.startOfDay(for: self)
    }

    var endOfDay: Date {
        var components = DateComponents()
        components.day = 1
        components.second = -1
        return Calendar.current.date(byAdding: components, to: startOfDay)!
    }

    var startOfMonth: Date {
        let components = Calendar.current.dateComponents([.year, .month], from: startOfDay)
        return Calendar.current.date(from: components)!
    }

    var endOfMonth: Date {
        var components = DateComponents()
        components.month = 1
        components.second = -1
        return Calendar.current.date(byAdding: components, to: startOfMonth)!
    }
}

// End of day = Start of tomorrow minus 1 second
// End of month = Start of next month minus 1 second
    回复于
  • 14

    你错过了 NSDayCalendarUnit in

    NSDateComponents *components = [cal components:( NSMonthCalendarUnit | NSYearCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit ) fromDate:date];
    回复于
  • 0

    Swift 4.2 - XCode 10 与 Date 类而不是 NSDate 和 Calender 而不是 NSCalender

    extension Date {

    var startOfDay : Date {
        let calendar = Calendar.current
        let unitFlags = Set<Calendar.Component>([.year, .month, .day])
        let components = calendar.dateComponents(unitFlags, from: self)
        return calendar.date(from: components)!
   }

    var endOfDay : Date {
        var components = DateComponents()
        components.day = 1
        let date = Calendar.current.date(byAdding: components, to: self.startOfDay)
        return (date?.addingTimeInterval(-1))!
    }
}

    用法：

    let myDate = Date()
    let startOfDate = myDate.startOfDay
    let endOfDate = myDate.endOfDay
    回复于
  • 153

    Swift3 使用 *XCode8
    Apple正在从类名中删除 NS ，以便 NSDate 可以换出 Date . 如果你试图让他们说他们总是会失败，你可能会得到一个编译器警告，但是当他们在操场上运行它们时它们工作正常 .

    我用 Date 替换了我在核心数据模型中生成的 NSDate ，它们仍然可以工作 .

    extension Date {
  func startTime() -> Date {
    return Calendar.current.startOfDay(for: self)
  }

  func endTime() -> Date {
    var components = DateComponents()
    components.day = 1
    components.second = -1
    return Calendar.current.date(byAdding: components, to: startTime())!
  }
}
    回复于

相关问题