如何添加一个月到一个NSDate？
如何将月份添加到NSDate对象？
NSDate *someDate = [NSDate Date] + 30Days.....; 你需要使用NSDateComponents ：
NSDateComponents *dateComponents = [[NSDateComponents alloc] init]; [dateComponents setMonth:1]; NSCalendar *calendar = [NSCalendar currentCalendar]; NSDate *newDate = [calendar dateByAddingComponents:dateComponents toDate:originalDate options:0]; [dateComponents release]; // If ARC is not used, release the date components
使用iOS 8和OS X 10.9，您可以使用NSCalendar添加NSCalendar ：
Objective-C的
NSCalendar *cal = [NSCalendar currentCalendar]; NSDate *someDate = [cal dateByAddingUnit:NSCalendarUnitMonth value:1 toDate:[NSDate date] options:0];
Swift 3
let date = Calendar.current.date(byAdding: .month, value: 1, to: Date())
Swift 2
let cal = NSCalendar.currentCalendar() let date = cal.dateByAddingUnit(.Month, value: 1, toDate: NSDate(), options: [])
例如，要在Swift中为当前date添加3个月：
let date = NSCalendar.currentCalendar().dateByAddingUnit(.MonthCalendarUnit, value: 3, toDate: NSDate(), options: nil)!
在Swift 2.0中：
let date = NSCalendar.currentCalendar().dateByAddingUnit(.Month, value: 3, toDate: NSDate(), options: [])
-
NSCalendarUnit的新的OptionSetType结构让你更简单地指定.Month - 采用
OptionSetType参数（如options:参数，采用NSCalendarOptions）不能nil，因此传入空集（[]）来表示“无选项”。
在Swift 2.0中
let startDate = NSDate() let dateComponent = NSDateComponents() dateComponent.month = 1 let cal = NSCalendar.currentCalendar() let endDate = cal.dateByAddingComponents(dateComponent, toDate: startDate, options: NSCalendarOptions(rawValue: 0))
对于迅速3.0
extension Date { func addMonth(n: Int) -> Date { let cal = NSCalendar.current return cal.date(byAdding: .month, value: n, to: self)! } func addDay(n: Int) -> Date { let cal = NSCalendar.current return cal.date(byAdding: .day, value: n, to: self)! } func addSec(n: Int) -> Date { let cal = NSCalendar.current return cal.date(byAdding: .second, value: n, to: self)! } }
你想添加一个“月”还是正好30天？ 如果是30天，你这样做：
// get a date NSDate *date = [NSDate dateWithNaturalLanguageString:@"2011-01-02"]; // add 30 days to it (in seconds) date = [date dateByAddingTimeInterval:(30 * 24 * 60 * 60)]; NSLog(@"%@", date); // 2011-02-01
注意：这不会将夏令时转换或闰秒考虑在内。 如果您需要，请使用@ TheEye的答案
适用于SWIFT 3.0
这里是function，你可以通过任何计数例如在这里减less日，月，日，我已经减less了当前系统date年100年，你可以做它的日，月也只是设置计数器，然后存储值在数组中，并做任何你想要做的数组
func currentTime(){ let date = Date() let calendar = Calendar.current var year = calendar.component(.year, from: date) let month = calendar.component(.month, from: date) let day = calendar.component(.day, from: date) let pastyear = year - 100 var someInts = [Int]() printLog(msg: "\(day):\(month):\(year)" ) for _ in pastyear...year { year -= 1 print("\(year) ") someInts.append(year) } print(someInts) }
其他答案工作正常，如果你想要的行为是增加一个月，并允许夏时制。 这产生了如下结果：
01/03/2017 00:00 + 1 month -> 31/03/2017 23:00 01/10/2017 00:00 + 1 month -> 01/11/2017 01:00
但是我想忽略DST丢失或获得的时间，例如：
01/03/2017 00:00 + 1 month -> 01/04/2017 00:00 01/10/2017 00:00 + 1 month -> 01/11/2017 00:00
因此，我检查是否通过了DST边界，如果是，则相应地增加或减去一个小时：
func offsetDaylightSavingsTime() -> Date { // daylightSavingTimeOffset is either + 1hr or + 0hr. To offset DST for a given date, we need to add an hour or subtract an hour // +1hr -> +1hr // +0hr -> -1hr // offset = (daylightSavingTimeOffset * 2) - 1 hour let daylightSavingsTimeOffset = TimeZone.current.daylightSavingTimeOffset(for: self) let oneHour = TimeInterval(3600) let offset = (daylightSavingsTimeOffset * 2) - oneHour return self.addingTimeInterval(offset) } func isBetweeen(date date1: Date, andDate date2: Date) -> Bool { return date1.compare(self).rawValue * self.compare(date2).rawValue >= 0 } func offsetDaylightSavingsTimeIfNecessary(nextDate: Date) -> Date { if let nextDST = TimeZone.current.nextDaylightSavingTimeTransition(after: self) { if nextDST.isBetweeen(date: self, andDate: nextDate){ let offsetDate = nextDate.offsetDaylightSavingsTime() let difference = offsetDate.timeIntervalSince(nextDate) return nextDate.addingTimeInterval(difference) } } return nextDate } func dateByAddingMonths(_ months: Int) -> Date? { if let dateWithMonthsAdded = Calendar.current.date(byAdding: .month, value: months, to: self) { return self.offsetDaylightSavingsTimeIfNecessary(nextDate: dateWithMonthsAdded) } return self }
testing：
func testDateByAddingMonths() { let date1 = "2017-01-01T00:00:00Z".asDate() let date2 = "2017-02-01T00:00:00Z".asDate() let date3 = "2017-03-01T00:00:00Z".asDate() let date4 = "2017-04-01T00:00:00Z".asDate() let date5 = "2017-05-01T00:00:00Z".asDate() let date6 = "2017-06-01T00:00:00Z".asDate() let date7 = "2017-07-01T00:00:00Z".asDate() let date8 = "2017-08-01T00:00:00Z".asDate() let date9 = "2017-09-01T00:00:00Z".asDate() let date10 = "2017-10-01T00:00:00Z".asDate() let date11 = "2017-11-01T00:00:00Z".asDate() let date12 = "2017-12-01T00:00:00Z".asDate() let date13 = "2018-01-01T00:00:00Z".asDate() let date14 = "2018-02-01T00:00:00Z".asDate() var testDate = "2017-01-01T00:00:00Z".asDate() XCTAssertEqual(testDate, date1) testDate = testDate.dateByAddingMonths(1)! XCTAssertEqual(testDate, date2) testDate = testDate.dateByAddingMonths(1)! XCTAssertEqual(testDate, date3) testDate = testDate.dateByAddingMonths(1)! XCTAssertEqual(testDate, date4) testDate = testDate.dateByAddingMonths(1)! XCTAssertEqual(testDate, date5) testDate = testDate.dateByAddingMonths(1)! XCTAssertEqual(testDate, date6) testDate = testDate.dateByAddingMonths(1)! XCTAssertEqual(testDate, date7) testDate = testDate.dateByAddingMonths(1)! XCTAssertEqual(testDate, date8) testDate = testDate.dateByAddingMonths(1)! XCTAssertEqual(testDate, date9) testDate = testDate.dateByAddingMonths(1)! XCTAssertEqual(testDate, date10) testDate = testDate.dateByAddingMonths(1)! XCTAssertEqual(testDate, date11) testDate = testDate.dateByAddingMonths(1)! XCTAssertEqual(testDate, date12) testDate = testDate.dateByAddingMonths(1)! XCTAssertEqual(testDate, date13) testDate = testDate.dateByAddingMonths(1)! XCTAssertEqual(testDate, date14) }
为了完整性，我正在使用.asDate（）方法
extension String { static let dateFormatter = DateFormatter() func checkIsValidDate() -> Bool { return self.tryParseToDate() != nil } func tryParseToDate() -> Date? { String.dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZZZZZ" return String.dateFormatter.date(from: self) } func asDate() -> Date { return tryParseToDate()! } }
