354

基本上，正如标题所说。我想知道如何将 1 天添加到NSDate.

所以如果是：

21st February 2011

它会变成：

22nd February 2011

或者，如果是：

31st December 2011

它会变成：

1st January 2012.
4

30 回答 30

761

斯威夫特 5.0： 

var dayComponent    = DateComponents()
dayComponent.day    = 1 // For removing one day (yesterday): -1
let theCalendar     = Calendar.current
let nextDate        = theCalendar.date(byAdding: dayComponent, to: Date())
print("nextDate : \(nextDate)")

目标 C：

NSDateComponents *dayComponent = [[NSDateComponents alloc] init];
dayComponent.day = 1;

NSCalendar *theCalendar = [NSCalendar currentCalendar];
NSDate *nextDate = [theCalendar dateByAddingComponents:dayComponent toDate:[NSDate date] options:0];

NSLog(@"nextDate: %@ ...", nextDate);

这应该是不言自明的。

于 2011-02-21T15:35:08.840 回答
280

从 iOS 8 开始，您可以使用NSCalendar.dateByAddingUnit

Swift 1.x 中的示例：

let today = NSDate()
let tomorrow = NSCalendar.currentCalendar()
    .dateByAddingUnit(
         .CalendarUnitDay, 
         value: 1, 
         toDate: today, 
         options: NSCalendarOptions(0)
    )

斯威夫特 2.0：

let today = NSDate()
let tomorrow = NSCalendar.currentCalendar()
    .dateByAddingUnit(
        .Day, 
        value: 1, 
        toDate: today, 
        options: []
    )

斯威夫特 3.0：

let today = Date()
let tomorrow = Calendar.current.date(byAdding: .day, value: 1, to: today)
于 2014-11-20T20:31:32.787 回答
117

斯威夫特 5

let today = Date()
let nextDate = Calendar.current.date(byAdding: .day, value: 1, to: today)

Objective-C

NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
// now build a NSDate object for the next day
NSDateComponents *offsetComponents = [[NSDateComponents alloc] init];
[offsetComponents setDay:1];
NSDate *nextDate = [gregorian dateByAddingComponents:offsetComponents toDate: [NSDate date] options:0];
于 2011-02-21T15:30:48.903 回答
38

iOS 8+、OSX 10.9+、Objective-C

NSCalendar *cal = [NSCalendar currentCalendar];    
NSDate *tomorrow = [cal dateByAddingUnit:NSCalendarUnitDay 
                                   value:1 
                                  toDate:[NSDate date] 
                                 options:0];
于 2014-11-20T20:54:30.057 回答
35

基于highmaintenance 的回答和vikingosegundo 的评论的工作Swift 3+ 实现。此日期扩展还具有更改年、月和时间的其他选项：

extension Date {

    /// Returns a Date with the specified amount of components added to the one it is called with
    func add(years: Int = 0, months: Int = 0, days: Int = 0, hours: Int = 0, minutes: Int = 0, seconds: Int = 0) -> Date? {
        let components = DateComponents(year: years, month: months, day: days, hour: hours, minute: minutes, second: seconds)
        return Calendar.current.date(byAdding: components, to: self)
    }

    /// Returns a Date with the specified amount of components subtracted from the one it is called with
    func subtract(years: Int = 0, months: Int = 0, days: Int = 0, hours: Int = 0, minutes: Int = 0, seconds: Int = 0) -> Date? {
        return add(years: -years, months: -months, days: -days, hours: -hours, minutes: -minutes, seconds: -seconds)
    }

}

OP 要求仅添加一天的用法将是：

let today = Date() // date is then today for this example
let tomorrow = today.add(days: 1)
于 2016-09-09T09:37:03.007 回答
25

Swift 4.0 （在这个精彩的答案中与 Swift 3.0 相同，只是让像我这样的新手清楚）

let today = Date()
let yesterday = Calendar.current.date(byAdding: .day, value: -1, to: today)
于 2018-03-17T06:14:42.593 回答
16

Swift 4 的更新：

let now = Date() // the current date/time
let oneDayFromNow = Calendar.current.date(byAdding: .day, value: 1, to: now) // Tomorrow with same time of day as now
于 2020-02-12T21:11:16.217 回答
15

使用以下函数并使用 days 参数获取日期 daysAhead/daysBehind 只需将参数传递为未来日期的正数或先前日期的负数：

+ (NSDate *) getDate:(NSDate *)fromDate daysAhead:(NSUInteger)days
{
    NSDateComponents *dateComponents = [[NSDateComponents alloc] init];
    dateComponents.day = days;
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDate *previousDate = [calendar dateByAddingComponents:dateComponents
                                                     toDate:fromDate
                                                    options:0];
    [dateComponents release];
    return previousDate;
}
于 2013-02-12T09:13:34.860 回答
12

迅速

var dayComponenet = NSDateComponents()
dayComponenet.day = 1

var theCalendar = NSCalendar.currentCalendar()
var nextDate = theCalendar.dateByAddingComponents(dayComponenet, toDate: NSDate(), options: nil)
于 2015-01-18T05:02:31.093 回答
10

有用！

NSCalendar *calendar = [NSCalendar currentCalendar];
NSCalendarUnit unit = NSCalendarUnitDay;
NSInteger value = 1;
NSDate *today = [NSDate date];
NSDate *tomorrow = [calendar dateByAddingUnit:unit value:value toDate:today options:NSCalendarMatchStrictly];
于 2016-02-25T15:15:07.683 回答
10

Swift 3.0 非常简单的实现是：

func dateByAddingDays(inDays: Int) -> Date {
    let today = Date()
    return Calendar.current.date(byAdding: .day, value: inDays, to: today)!
}
于 2016-10-11T22:14:10.157 回答
9

斯威夫特 4.0

extension Date {
    func add(_ unit: Calendar.Component, value: Int) -> Date? {
        return Calendar.current.date(byAdding: unit, value: value, to: self)
    }
}

用法

date.add(.day, 3)!   // adds 3 days
date.add(.day, -14)!   // subtracts 14 days

注意：如果您不知道为什么代码行以感叹号结尾，请在 Google 上查找“Swift Optionals”。

于 2019-03-15T15:54:11.790 回答
7 
NSDate *today=[NSDate date];
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier: NSGregorianCalendar];
NSDateComponents *components=[[NSDateComponents alloc] init];
components.day=1;
NSDate *targetDate =[calendar dateByAddingComponents:components toDate:today options: 0];
于 2013-03-07T09:00:40.990 回答
5 
NSDateComponents *dayComponent = [[[NSDateComponents alloc] init] autorelease];
dayComponent.day = 1;

NSCalendar *theCalendar = [NSCalendar currentCalendar];
dateToBeIncremented = [theCalendar dateByAddingComponents:dayComponent toDate:dateToBeIncremented options:0];

好的 - 我认为这对我有用。但是，如果您使用它将 2013 年 3 月 31 日添加一天，它将返回一个仅添加 23 小时的日期。它实际上可能有 24 个，但在计算中使用只增加了 23:00 小时。

同样，如果您向前推进到 2013 年 10 月 28 日，代码会增加 25 小时，从而导致日期时间为 2013-10-28 01:00:00。

为了增加一天我在顶部做的事情，添加：

NSDate *newDate1 = [now dateByAddingTimeInterval:60*60*24*daysToAdd];

复杂，主要是由于夏令时。

于 2013-02-12T15:42:02.090 回答
5

这是一种通用方法，可让您在指定日期添加/减去任何类型的单位（年/月/日/小时/秒等）。

使用Swift 2.2

func addUnitToDate(unitType: NSCalendarUnit, number: Int, date:NSDate) -> NSDate {

    return NSCalendar.currentCalendar().dateByAddingUnit(
        unitType,
        value: number,
        toDate: date,
        options: NSCalendarOptions(rawValue: 0))!

}

print( addUnitToDate(.Day, number: 1, date: NSDate()) ) // Adds 1 Day To Current Date
print( addUnitToDate(.Hour, number: 1, date: NSDate()) ) // Adds 1 Hour To Current Date
print( addUnitToDate(.Minute, number: 1, date: NSDate()) ) // Adds 1 Minute To Current Date

// NOTE: You can use negative values to get backward values too
于 2016-04-18T13:54:35.537 回答
5

在 Swift 2.1.1 和 xcode 7.1 OSX 10.10.5 中，您可以使用函数向前和向后添加任意天数

func addDaystoGivenDate(baseDate:NSDate,NumberOfDaysToAdd:Int)->NSDate
{
    let dateComponents = NSDateComponents()
    let CurrentCalendar = NSCalendar.currentCalendar()
    let CalendarOption = NSCalendarOptions()

    dateComponents.day = NumberOfDaysToAdd

    let newDate = CurrentCalendar.dateByAddingComponents(dateComponents, toDate: baseDate, options: CalendarOption)
    return newDate!
}

将当前日期增加 9 天的函数调用

var newDate = addDaystoGivenDate(NSDate(), NumberOfDaysToAdd: 9)
print(newDate)

将当前日期递减 80 天的函数调用

newDate = addDaystoGivenDate(NSDate(), NumberOfDaysToAdd: -80)
 print(newDate)
于 2016-01-05T10:59:18.777 回答
4

- (id)dateByAddingTimeInterval:(NSTimeInterval)seconds您可以在哪里使用 NSDate 的seconds方法60 * 60 * 24 = 86400

于 2011-02-21T15:31:13.723 回答
4

在 swift 中，您可以进行扩展以在 NSDate 中添加方法

extension NSDate {
    func addNoOfDays(noOfDays:Int) -> NSDate! {
        let cal:NSCalendar = NSCalendar.currentCalendar()
        cal.timeZone = NSTimeZone(abbreviation: "UTC")!
        let comps:NSDateComponents = NSDateComponents()
        comps.day = noOfDays
        return cal.dateByAddingComponents(comps, toDate: self, options: nil)
    }
}

你可以用它作为

NSDate().addNoOfDays(3)
于 2015-12-09T12:42:48.517 回答
4

任何日期的昨天和明天的简单 Swift 扩展：

extension Date {
    
    var previousDay: Date {
        Calendar.current.date(byAdding: DateComponents(day:-1), to: self)!
    }
    
    var nextDay: Date {
        Calendar.current.date(byAdding: DateComponents(day:+1), to: self)!
    }
    
}

我根据此处问题中的建议强制解包选项：
dateByAddingComponents:toDate:options 何时返回 nil？

于 2021-10-08T21:54:05.913 回答
3

对于 Swift 2.2：

let today = NSDate()
let tomorrow = NSCalendar.currentCalendar().dateByAddingUnit(
        .Day,
        value: 1,
        toDate: today,
        options: NSCalendarOptions.MatchStrictly)

希望这对某人有帮助！

于 2016-05-04T01:24:22.217 回答
3 
NSDate *now = [NSDate date];
int daysToAdd = 1;
NSDate *tomorrowDate = [now dateByAddingTimeInterval:60*60*24*daysToAdd];

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"EEEE, dd MMM yyyy"];
NSLog(@"%@", [dateFormatter stringFromDate:tomorrowDate]);
于 2015-10-30T07:29:52.823 回答
2 
NSDate *now = [NSDate date];
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:now];
NSDate *startDate = [calendar dateFromComponents:components];
NSLog(@"StartDate = %@", startDate);

components.day += 1;
NSDate *endDate = [calendar dateFromComponents:components];
NSLog(@"EndDate = %@", endDate);
于 2013-11-15T02:52:01.480 回答
2

我有同样的问题; 使用 NSDate 的扩展：

- (id)dateByAddingYears:(NSUInteger)years
                 months:(NSUInteger)months
                   days:(NSUInteger)days
                  hours:(NSUInteger)hours
                minutes:(NSUInteger)minutes
                seconds:(NSUInteger)seconds
{
    NSDateComponents * delta = [[[NSDateComponents alloc] init] autorelease];
    NSCalendar * gregorian = [[[NSCalendar alloc]
                               initWithCalendarIdentifier:NSCalendarIdentifierGregorian] autorelease];

    [delta setYear:years];
    [delta setMonth:months];
    [delta setDay:days];
    [delta setHour:hours];
    [delta setMinute:minutes];
    [delta setSecond:seconds];

    return [gregorian dateByAddingComponents:delta toDate:self options:0];
}
于 2015-01-19T22:26:49.907 回答
2

Swift 5 的更新

let nextDate = fromDate.addingTimeInterval(60*60*24)
于 2020-05-25T06:10:54.433 回答
2

字符串扩展：转换String_Date > Date

extension String{
  func DateConvert(oldFormat:String)->Date{ // format example: yyyy-MM-dd HH:mm:ss 
    let isoDate = self
    let dateFormatter = DateFormatter()
    dateFormatter.locale = Locale(identifier: "en_US_POSIX") // set locale to reliable US_POSIX
    dateFormatter.dateFormat = oldFormat
    return dateFormatter.date(from:isoDate)!
  }
}

日期扩展：转换日期 > 字符串

extension Date{
 func DateConvert(_ newFormat:String)-> String{
    let formatter = DateFormatter()
    formatter.dateFormat = newFormat
    return formatter.string(from: self)
 }
}

日期扩展： 获取 +/- 日期

extension String{
  func next(day:Int)->Date{
    var dayComponent    = DateComponents()
    dayComponent.day    = day
    let theCalendar     = Calendar.current
    let nextDate        = theCalendar.date(byAdding: dayComponent, to: Date())
    return nextDate!
  }

 func past(day:Int)->Date{
    var pastCount = day
    if(pastCount>0){
        pastCount = day * -1
    }
    var dayComponent    = DateComponents()
    dayComponent.day    = pastCount
    let theCalendar     = Calendar.current
    let nextDate        = theCalendar.date(byAdding: dayComponent, to: Date())
    return nextDate!
 }
}

用法：

let today = Date()
let todayString = "2020-02-02 23:00:00"
let newDate = today.DateConvert("yyyy-MM-dd HH:mm:ss") //2020-02-02 23:00:00
let newToday = todayString.DateConvert(oldFormat: "yyyy-MM-dd HH:mm:ss")//2020-02-02
let newDatePlus = today.next(day: 1)//2020-02-03 23:00:00
let newDateMinus = today.past(day: 1)//2020-02-01 23:00:00

参考：来自多个问题
如何将 1 天添加到 NSDate？
将正整数转换为负数和负数转换为正数的数学函数？
将 NSString 转换为 NSDate（然后再返回）

于 2020-03-10T20:47:08.027 回答
2

斯威夫特 2.0

let today = NSDate()    
let calendar = NSCalendar.currentCalendar()
let tomorrow = calendar.dateByAddingUnit(.Day, value: 1, toDate: today, options: NSCalendarOptions.MatchFirst)
于 2016-09-30T15:32:17.503 回答
2

在 Swift 4 或 Swift 5 中，您可以像下面这样使用：

let date = Date()
let yesterday = Calendar.current.date(byAdding: .day, value: -1, to: date)
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
let yesterday_date = dateFormatter.string(from: yesterday!)
print("yesterday->",yesterday_date)

输出：

Current date: 2020-03-02
yesterday date: 2020-03-01
于 2020-03-02T13:20:45.747 回答
2

Swift 4，如果您真正需要的是 24 小时轮班（60*60*24 秒）而不是“1 个日历日”

未来： let dayAhead = Date(timeIntervalSinceNow: TimeInterval(86400.0))

过去的： let dayAgo = Date(timeIntervalSinceNow: TimeInterval(-86400.0))

于 2018-02-16T23:06:41.593 回答
1

只是为了好玩，通过一些扩展和运算符重载，你可以得到一些不错的东西，比如：

let today = Date()
let tomorrow = today + 1.days

， 或者

var date = Date()
date += 1.months

下面是支持代码：

extension Calendar {
    struct ComponentWithValue {
        let component: Component
        let value: Int
    }
}

extension Int {
    var days: Calendar.ComponentWithValue {
        .init(component: .day, value: self)
    }
    
    var months: Calendar.ComponentWithValue {
        .init(component: .month, value: self)
    }
}

func +(_ date: Date, _ amount: Calendar.ComponentWithValue) -> Date {
    Calendar.current.date(byAdding: amount.component, value: amount.value, to: date)!
}

func +(_ amount: Calendar.ComponentWithValue, _ date: Date) -> Date {
    date + amount
}

func +=(_ date: inout Date, _ amount: Calendar.ComponentWithValue) {
    date = date + amount
}

代码最少，可以轻松扩展以允许.months, .years,等。还可以无缝添加.hours对减法 ( ) 的支持。-

但是，在运算符的实现中存在强制展开，但+不确定日历在哪些情况下可以返回 nil 日期。

于 2021-09-17T10:11:28.820 回答
-3

使用以下代码：

NSDate *now = [NSDate date];
int daysToAdd = 1;
NSDate *newDate1 = [now dateByAddingTimeInterval:60*60*24*daysToAdd];

作为

addTimeInterval

现在已弃用。

于 2012-08-23T09:12:56.003 回答